Material: High Speed Steel Type: 10-45mm (10,15,20,25,30,35,40,45mm) Stem: 25 x 12mm Dimensions: 45 x 100mm Widely used for cutting holes in a variety of materials such as steel, wood, thin iron, aluminum alloy aluminum, insulation boards, PVC films, etc. Features: Color: gold (as the picture). Material: high-grade steel speed. Surface: titanium. Stem: triangular round handle. Type: 10-45 mm. Stem: 25 x 12mm Dimensions: 45 x 100mm Features: Automatic hole deburring, as you drill. High Speed Steel and durable. Titanium coating to reduce friction and work cooler. Application: thin iron board, aluminum, insulation board, 4mm thick PVC board inside wood. Widely used for cutting holes in a variety of materials such as steel, wood, fiber er, aluminum alloy, insulation boards, PVC films, etc. Contents: 1 spiral drill 10-45 mm.