1、[Material]The hole saw material is carbide, with high hardness and toughness to ensure its cutting strength and wear resistant, strong and long lasting. 2、[10Pcs Hole Saw Set]10Pcs hole cutters with dimension 16mm, 18mm, 20mm, 22mm, 25mm, 30mm, 35mm, 45mm, 50mm, 53mm, 10 pcs pilot drill bits and 1pcs hex wrench. A variety of sizes to meet your different needs. 3、[Cutting]Hole drill adopts multi tooth alloy bit combination design, consisting of inner, middle and outer cutting edges, with spring loaded guided drills for fast drilling and clean removal of clogs. 4、[High precise and Easy to Use]Carbide steel teeth for fast cutting of clean round holes. Suitable for hand electric drill, bench drill and flat drill. 5、[Widely Used]The carbide hole saw is widely used to cut and process metal materials, stainless steel, iron, alloy steel, cast iron, carbon steel, abrasive steel, copper, aluminium alloy and so on according to different materials.