Hard Ceramic Drill Bits

Product Overview

GUSHI HDBG Hard Ceramic Drill Bits are tungsten carbide tipped spear-point bits built for the materials that defeat ordinary twist drills — hard ceramic tile, soft tile, hard stone, roof tiles and glass. The carbide tip is welded to a 45# steel body and shaped into a self-centring spear point that starts holes accurately without slipping. Offered in 3–12mm diameters with a 1/4" (6.35mm) hex shank for quick-change rotary drills, a single bit typically delivers around 42 holes in standard ceramic. Manufactured by Huzhou Gu's Imp. & Exp. Co., Ltd. (founded 2004, ISO 9001 and MPA certified) with an OEM MOQ of 200 pieces.

The defining advantage is the carbide tip. Ceramic, porcelain, glass and stone are abrasive and brittle — a standard HSS twist bit either skates across the surface or overheats and dulls within a hole or two. The HDBG's tungsten-carbide spear point bites in immediately, cuts cleanly through the glaze, and holds an edge long enough to punch dozens of holes. The specially designed centring tip means you do not need a punch or pilot hole to keep the bit on mark.

The 1/4 inch hex shank is a practical, job-site feature: it locks into quick-change chucks and impact drivers in rotary mode, transmits maximum torque without rounding out, and will not spin loose mid-hole the way a round shank can. For distributors serving the tile, bathroom, kitchen and roofing trades, the HDBG is a high-turnover, low-cost SKU with a clear value story — clean holes, no cracked tiles, and a bit that outlasts a dozen cheap twist drills on ceramic.

GUSHI supports the line with OEM branding, custom packaging (PVC pouch, blister card or skin card), colour coating (TiN / sandblasting / nickel) and mixed-size sets. The same manufacturing platform also produces diamond core drill bits for high-volume stone work — see the related drilling tools for the wider range.

Full Specifications

How the Ceramic Drill Bit Works

1. Carbide Spear Tip Bites In and Cuts Clean Through Glaze

The tungsten-carbide (YG6X) tip is far harder than the steel or ceramic it meets, so it scores and penetrates the glazed surface instead of skating across it. The spear profile concentrates force at the point, letting the bit enter hard tile on the first revolution. Because the tip is welded and heat-treated, it keeps a sharp cutting edge through dozens of holes rather than dulling like an HSS bit.

2. Centring Tip Stops Wandering and Cracking

A specially designed centring tip holds the bit on the marked spot at start-up, removing the need for a punch or pilot and preventing the bit from walking across the slick tile face. Accurate entry is what keeps the surrounding glaze from chipping — especially important on visible bathroom and kitchen work.

3. Hex Shank Delivers Maximum Torque Without Slipping

The 1/4 inch (6.35mm) hex shank locks into quick-change chucks and impact drivers in rotary mode, transmitting full torque with no round-out. It will not spin loose under load the way a round shank can, so the bit stays engaged and cuts straight — a small but decisive job-site advantage on a cordless drill.

Key Features Explained

Carbide Technology Tip — Especially Durable

The carbide tip is the reason these bits outlast ordinary drill bits on tile and stone. Tungsten carbide resists the abrasion of ceramic and glass far better than high-speed steel, so a single HDBG bit makes around 42 holes in standard ceramic instead of the one or two a twist bit manages before it dulls and smokes.

Centring Tip — Accurate Start, No Cracks

The self-centring design means the bit bites exactly where you mark it. That accuracy is what prevents the edge chipping that ruins a visible tile. For best results still lay a strip of masking tape over the mark — it gives the tip extra bite on the first turn and removes cleanly afterward.

Hex Shank — Strong Connection, Maximum Torque

The hex shank grips harder and transmits more torque than a round shank of the same diameter, and it is quick-change compatible for fast bit swaps on a cordless drill. For distributors, it is also a clear differentiator from generic round-shank tile bits on the shelf.

Water Cooling Extends Life and Protects the Work

Drilling tile and glass generates heat that cracks the workpiece and cooks the carbide. A light, continuous water spray (or a wet sponge held at the point) keeps both cool: the hole stays clean, and the bit's life roughly doubles. Dry drilling on a rotary drill is fine for a few holes but wears the tip quickly.

Size Selection Guide (HDBG Series)

Choose the diameter by the anchor, screw or pipe you are fixing, and the material thickness. Lengths run from 60mm on the small sizes to 100mm on the 10–12mm bits.

Applications & Suitable Materials

Typical Applications

Suitable Materials

HDBG vs. Standard Twist Drill / Diamond Core Bit

For brittle materials, the right bit depends on volume and hole type. Here is how the HDBG carbide bit compares with the two common alternatives:

Bottom line: For the vast majority of tile-mounting, bathroom, kitchen and roofing jobs, the carbide HDBG bit is the practical, economical pick — it starts cleanly, lasts dozens of holes, and fits the cordless drill already on the truck. Reach for a diamond core bit only when volume or diameter demands it.

How to Use: Step-by-Step Drilling Guide

1. Confirm the material — annealed glass, ceramic or stone only. Never drill tempered glass, metal or wood with this bit.
2. Set the drill to non-hammer / rotary mode. Hammer action will shatter the workpiece and destroy the carbide tip.
3. Mark the spot and lay a strip of masking tape over it to stop the bit walking on the first turn.
4. Fit the 1/4" hex shank into a quick-change chuck or standard drill chuck and seat it fully.
5. Start at the lowest speed with very light pressure; let the centring tip bite and establish the hole.
6. Apply a continuous water spray or a wet sponge at the drill point to keep tip and tile cool.
7. Increase speed only once the hole is established; keep pressure light and steady — never force it.
8. Back the bit out periodically to clear slurry and let it cool, especially on deep or large holes.
9. For glass, support the back face and drill from the front; break through slowly to avoid chipping the exit.
10. Stop if the bit smokes, wanders, or the tip goes dull — replace it; forcing a worn bit cracks tiles.
11. After drilling, clean the bit and store it dry to prevent rust on the steel body.
12. Replace the bit once it no longer centres or cuts cleanly; a fresh tip is cheaper than a ruined tile.

For more guidance, see our related tools: diamond cutting wheels, turbo saw blades, and the full diamond tool range.

Frequently Asked Questions

OEM & Wholesale Information

Huzhou Gu's Imp. & Exp. Co., Ltd. has manufactured and exported diamond and carbide tools since 2004. The company is one of 23 Chinese manufacturers that won the U.S. anti-dumping case for diamond blades (exporting under a competitive 6.2% duty), and counts distributors in the USA, Canada, Germany, UK, Netherlands, Italy, Portugal, Poland, Czech Republic, Brazil, Chile, Australia and South Africa among its customers — many for more than 10 years. Every 10 pieces of Chinese diamond blades exported to Brazil, 2 come from GUSHI.

Explore the complete range: Diamond Saw Blades, Turbo Saw Blades, and Dry Cutting Diamond Blades.