[Top Quality]Made from high quality Tungsten Carbide Tipped , High-grade Heat Treated cemented carbide Tooth, ensuring high hardness, rust proof, sturdy and durable; [Size ]Cutting diameter:1/2 inch (12.7mm), 9/16 inch (14mm), 5/8 inch(16mm),3/4 inch(19mm), 7/8 inch(22mm), 1 inch(25.5mm),1-1/8 inch(29mm), 1-3/8 inch(35mm), 1-5/8 inch(41mm), 1-3/4 inch(45mm), 2 inch(51mm), 2-1/8 inch(54mm), Dia.: 10mm(2/5 Inch) , perfect for drilling Metal; [Unique Three-blade Design] This teeth designed with Three-blade, Include outer blade, middle blade, and inner blade, making it sharper and more efficient, perfect for cutting metals; [ Tools]This set apply to Bench drill, magnetic drill, drill, drill percussion and so on. Perfect for metal, stainless steel plate, square tube, iron, cast iron, wood, F.R.P and other general sheet metal;Note: Cannot be used for concrete, tiles, glass and stone. [High precision and Easy to Use] Carbide Steel teeth for fast cutting of clean, round holes. Suitable for hand electric drill, stand motor- drilling machine and mobile ribbon type magnetism drilling machine; Material: metal Color: as shown Package Contents: 12pcs Carbide Bit 2pcs Extra Pilot Drill bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.