The 3pcs screwdriver extension bits are built-have magnetic, for use in hand-held drivers or power drills, to extend all kinds of screwdriver bits.

Features:
Interface has a locking mechanism, built-have magnetic, automatically pop up batch head.
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.
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.

Specifications:
Material: Chrome Vanadium Steel
Color: Black
Hex Shank: 6.35mm( 1/4" )
Fir for: 1/4" shank dirver bit
Package Weight: 118g / 4.16ounces
Package Size: 170 * 50 * 10mm / 6.69 * 1.97 * 0.39in

Packing List:
3 * Screwdriver Extension Bits