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 heat size:1/4 inch hex Used 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.perfect for the workshop, DIY, toolbox, home crafts, hobbyists, modellers or for trade usecolour:goldenPackage Includes:2 x 3-13mm Hex Step Drill BitOnly the above package content, other products are not included.Note: Light reflection 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.