Shank Design: The -shape and hex insert allow the bit to hold the bit securely in place for quicker installations.Deepen Drive Design: 36mm depth drive.Great for working with hard to reach screws.Hardened Chrome Vanadium: Designed and engined for long life and good durability for operating.Used in manufacturing assembly systems and others.Designed for 1/4 inch hex shank impact Extention Screwdriver Drill Bit Holder.Colour: silverMaterial: chromium vanadiumSize: length 150mmPackage Contents:8 * screwdriver bit (6mm, 7mm, 8mm, 9mm) , 10mm, 11mm, 12mm, 13mm each 1)Only 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.