The 1/4 extension shaft is flexible, bendable, rotatable at many different angles. It done the drilling in most of the small space, gaps without limitation. Make your installation work more flexible, comfortable and efficient. Covered by premium plastic casing to protect your hands from hurting and perfectly completes the work. The inner shaft made of durable metal materials, with wide adjustable angle. Wide range of use which compatible with small wrench / cordless screwdriver / low speed dc hand drill/ torque drill/ electric screwdriver. Mainly used in electrical cabinets, furnitures, electrical appliances and other narrow space screwdriver. The 1/4 Screwdriver Bit Holders are in 3 different SIZE, 60/100/150mm, with build in magnetic (in the bottom of the hole part) holding the bits stay in place. Moreover, it has a locking mechanism, automatically pop up batch head. This drill bit extension set can work with electric screwdriver, handheld screwdriver, drills and so on. Its the must have item in your toolkit box.Products from GuanGuan's store