This Flexible shaft can be used for formula hand drill chuck, it can also be used for electric screwdrivers. Made from chrome-vanadium steel, durable and lasting to use. Lightweight, quick connect to the standard hex 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 screwdrivers can not work in an environment operations.