General description Perfect drill bits suitable for drilling holes in various materials, including iron plate, copper plate, aluminum plate, wood, PVC sheet, and insulation boards. Not suitable for hard and brittle materials such as stainless steel, glass, tiles, and walls. Technical specifications Sizes: 4-12mm, 4-20mm, 4-32mm Material: Steel Color: Gold Measurement allowed error: +/- 1-3 cm Usage Two flutes for more efficient cutting. The High Step design allows you to feel the stop, preventing accidental drilling of larger holes. Other information Package Contents: 2 x 4-12mm Drill Bit, 2 x 4-20mm Drill Bit, 2 x 4-32mm Drill Bit, 2 x Blue Cloth Bag. Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product.