Wide range of applications: The cutter head base cordless screwdrivers are suitable for extending different screwdriver heads and drill bits. Can be installed on a variety of tools, such as impact wrench, electric screwdriver, manual screwdriver, electric drill, gas drill, etc. Convenient installation: When installing, simply press the red sleeve of the quick change BIT base, and the Hexagon of the quick change BIT base is exposed; The drill bit is then inserted into the hex head and the magnetic bit holder can automatically clamp the drill bit. High-quality materials: high-carbon steel holder for maximum durability, sturdy construction for long-lasting extended service life, high strength and wear resistance, not easy to break or damage. The aluminum alloy sleeves are corrosion-resistant and not rusty, which can better protect the drill bit from corrosion. Special note: This magnetic drill seat can only be installed at using a single-head screwdriver and not a double-head screwdriver; Universal 1/4" hex handle and 1/4" hex socket are suitable for most electric screwdrivers, hand screwdrivers and drill bits Bit holders have strong magnetism, can be connected or disconnected quickly and are held in position while driving; Small size allows you to extend the bit anywhere for any job and fits many tool bags; It is helpful to remove or tighten a large amount of screws after starting or loosening