1. Adopting high carbon steel body and high-speed steel teeth, providing flexibility and durability. 2. The hole saw has a variable tooth pitch, which can cut quickly and smoothly, extending the lifespan of the hole saw. The chip hole makes it easy to disassemble the plug. 3. HSS tool teeth are suitable for most materials, such as wood, particle board, plywood, non laminated plastic, gypsum board, etc.