Hole Saw Set 10Pcs Alloy Steel Heavy Duty Carbide Tct Carbide, And Plastic Plate Loosen the hex screw with a hex key Insert the drill bit into the hole saw center Tighten the hex screw with the hex key Install the hole saw in a proper tool like hand drill or bench drill ?High-quality material: Made of industrial grade TCT Cemented Carbide Steel, Extremely durable, with corrosion resistance and a hard surface to ensure it has a long life. ?10PCS Hole saw set Packaging:16mm(5/8''),18mm(45/64''),20mm(25/32''),22mm(7/8''),25mm(1''),30mm(1-3/16''),35mm(1-3/8''),45mm(1-25/32''),50mm(1-31/32''),53mm(2-5/64'')and 1*L-Wrench ?Convenient cutting: Tooth-shaped blade for faster cutting speed; double-layer ring for easy removal of metal chips, with efficient cooling? ?More Suitable for stainless steel, metal, iron and plastic, aluminum, glass steel and other materials; suitable for rechargeable electric drill, portable hand drill, table drill, electric drill and other tools. ?Safety tip: Please wear protective glasses and gloves when using our hole saw sets and remember to add coolant when drilling continuously at high speed.