Features:
Hard steel holder for maximum durability, the heavy-duty construction
allows for long service life.
Bit holders have magnetism for quick connect or disconnect and ensuring stay in place while driving. 
Universal 1/4inch quick hex shank and 1/4inch hex socket fit most electric screwdrivers, drills and bits.
The small size allows you
to bring your bit extension anywhere to get any job done and can fit into many tool bag. 
There are three extension holders in different lengths and you can use the proper one for various needs.

Specifications:
Material: Carbon steel and chromium-vanadium steel
Hex Shank Size: 1/4"
Hex Socket Size: 1/4"
Length: 6cm / 2.36", 10cm / 3.93", 15cm / 5.9"
Quantity: 3
Package Includes:
3 x Bit Hold