Widely UsedThe hole saw is widely used in plasterboard, 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 MaterialOur circular drill bit is made of heat-treated and blackened carbon steel. It has functions of oil-proof and rust-proof, high hardness, good toughness and durability. sharp blade, high hardness, wear during operation, chip and reliable. Metal hole cutter with precision without wobble. Intelligent DesignHole saws for cutting circular holes use spring design to promote chip removal, the drilling efficiency is higher, with a hexagonal handle, closes 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. Product Description Hole Saw, Bi-Metal Cutter Hole Cutting Tool Use for drilling wood, iron, aluminum alloy and so on. Features: Clean edges without binding which can be cut smooth and fast. Silicon carbide coating surface treatment to improve rust resistance. Designed for repeated use and convenient for working on desktop cable inserts ( plastic desk eyelets). Features: Material: HSS M42 steel. Color: red. Diameter: 40 mm Contents: 1 * hole saw.