【Widely Used】The hole saw is widely used in gypsum board, steel, aluminum, non-ferrous metals, copper, brass, wood, plastic and PVC and other materials. Suitable for bench drill, electromagnetic drill, pistol drill, impact drill, etc. 【Professional Hole Saw Material】Our circular drill bit is made of heat-treated and blackened carbon steel. It has oil-resistant and rust-proof functions, high hardness, good toughness and durability. sharp blade, high hardness, wear during operation, chip and reliable. Metal Hole Cutter with Precision without Shaking. 【Intelligent Design】The hole saws for cutting circular holes use spring design to promote chip removal, drilling efficiency is higher, with hexagonal handle, close firmly. With the clean edge design, this hole saw kit is smooth and easy. The spring on the drill automatically pushes the disc out of the saw immediately after completing the hole. Features: Clean edges without binding that can be cut smooth and fast. Silicon carbide coating