Material: HSS / High Speed SteelSurface treatment:Titanium coatedType:11 steps (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm)With the Titanium coated to reduce friction and heatShank size:1/4 inch hex shankUsed in hardness under 25 Degree workpiece, the plate thickness under 5mm, such as carbon steel plate, sheet iron, insulation boards, wood. Cannot be used for stainless steel.Ideal for the workshop, DIY, toolbox, home crafts, hobbyists, modellers or for trade usecolour:goldenPackage Includes:1 x 3-13mm Hex Shank Step Drill BitNote: 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.