This Flexible shaft can be used for general formula hand drill chuck, it can also be used for electric screwdriver screwdriver. 
Flexible shaft head can be mounted hexagonal shank (1/4 handle) the first batch, mainly used in computer chassis, electrical cabinets, furniture, electrical appliances and other narrow space screwdriver can not work in an environment operations. 

Specification:

✦ Material: Plastic and  Metal
✦ Full length: 295mm
✦ Flexible shaft dimensions: Hex shank: 6.35mm ( 1/4" )
✦Inner hexagon head : 6.35mm ( 1/4" )
✦ Color: Black