Check the listing for details. 4PC Extension Screwdriver Drill Bit Flexible Shaft Holder Impact Driver Tool Set. Color: Black, Condition: New. Listed at 7.99 USD. Description： - 100% brand new and high quality - Interface has a locking mechanism,built-have magnetic,automatically pop up batch head (except the Flexible one ) - Extend all kinds of screwdriver bits,screwdriver head conversion uses.Fast fastening,greatly improve work efficiency - For use in hand-held drivers or power drills, this 1/4 inch female by 1/4 inch male magnetic bit holder - Very helpful to remove or tighten a large number of screws after you've started or loosened them - Suitable for drill,screwdriver,batch head and other to transfer.has a hardened and tempered steel shaft with a quick-release chuck Material: metal Color: Black ,SilverHex shank: 6.35mm( 1/4" ) Fir for: 1/4" shank dirver bit Length: Small:6cm, Medium:10cm, Large:15cm ,Flexible:20cm Note: This hex shank bit is not suitable for double interface bits Interface is over a system of the locks, built have magnetic, automatic up batch head Suitable for drill bits, screwdrivers, batch head and other transfer Extend all kinds of screwdriver bits, screwdriver head conversion used Fast fastening, greatly improve working efficiency Package Included:4pcs x 1/4" mm hex shank Bit HolderNote: Please allow 1-3cm difference due to manual measurement. Due to light and screen differences, the color of the item may be slightly different from the pictures