[High-quality material] These drill holders are made of chrome vanadium steel (CR-V), which has very good wear resistance and extremely high hardness, and has a long service life. Essential drill and screwdriver accessory kit. [Easy to Assemble and Strong Magnetism] The magnetic screwdriver bit has a locking mechanism in the interface, a built-in strong magnet and a screwdriver head. automatic ejection, which can be quickly fixed in private and professional areas. The durable magnet firmly holds the drill bit in place without losing it. [Perfect Extension Length] 3 different lengths: 60mm, 100mm, 150mm, very suitable for your tools. This can be used to extend any type of hex shank drill bit and convert it with a screwdriver bit. [General and practical] This drill bit holder set is a good accessory for conversion, suitable for 1/4" hex drills, electric drills and screwdrivers. [Wide range of applications] Suitable for DIY, professionals, maintenance, etc. A must-have tool for DIY and