About This 4Pack Bit Holder — Made of Cr-V Steel6inches(150mm) quick connect drill bit holder, Heat-treated manufacturing for increased durability. Quick change and release, very easy to use. High Precision — This extension bit shaft is very straight, it almost has no wobbling when you use it with impact screwdriver. Magnetic + Lock — The magnet is located inside the tube and Interface come with locking mechanism, securely holds the bits in place, reduces the possibility of wobble or fall out, ensures the accuracy of your power drill or other devices. Extend The Area of Bits — 1/4” Hex Shank and 6inches length, perfect for tight places which is hard to reach screws. Widely Used— Magnetic Extension Socket Drill Bit Holder,Universal fit electric screwdrivers, manual screwdrivers, T-handle 1/4" driver screwdrivers, corded drills, cordless drills, power drill, impact drivers or any other devices with 1/4 inch hex shank. Unlimited Uses in Automotive, Hardware, Hobby, Home, etc. Overview Brand : GEINXURN Number of Items : 4 Head Style : Hex Material : Chrome Vanadium Steel Recommended Uses For Product : bit holder extension