[Widely Used]Perfect Step Drill Bits suitable for drill holes in various material: within 3mm/012 inch (Iron Plate, Copper Plate, Aluminum Plate); within 5mm/02 inch (Wood, PVC sheet, Insulation Boards). Not suitable for hard and brittle materials such as stainless steel, glass, tile floors, walls etc.[Material]High speed steel More capable and durable.[Easy Drilling]Two-Flute Design for smoother cutting. High Step design let you feel the stop and never drill bigger in mistakeColour:GoldenMaterial:High speed steelPackage Contents:1 x 4-12mm drill bit1 x 4-20mm drill bit1 x 4-32mm drill bit1 x blue cloth bagOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.