1、[Quick Release] The quick replace and release system for the adapter bar allows you to easily attach, lock and unlock the drill. 2、[Easy Removal] The magnetic drill bit holder offers easy screw removal and fixing, facilitating your efficient work. 3、[Hex Shank] This bit has a 1/4in hex shank and is easy to mount on electric screwdrivers, drills and hand screwdrivers. 4、[Chrome Vanadium Steel] The bit holder is made of chrome vanadium steel, which has very good mechanical properties and hardness, so you don't have to worry about wear and tear in long term use. 5、[Extension Kits] This magnetic bit adapter is an extension kit for multiple screwdriver bits and conversion screwdriver bits. 3 x Magnetic Extension Chuck Adapter Item Type: Magnetic Extension Chuck AdapterMaterial: Chrome vanadium steelSpecifications: Approx. 60mm / 2.36in, Approx. 100mm / 3.94in, Approx. 150mm / 5.91inUse: Extend the length of the head, suitable for single head, socket and other hexagonal toolsColour: Black, Silver