Material Steel High carbon steel, high quality material to be avoided during use. General Use These extensions, adapters and reducers are designed for Impact use and feature spring loaded stop balls to lock the sockets securely, while the through holes at the end drive adapters and reducers lock onto the drive rod. convenience, whatever tool you choose to use. Ideal for DIY, housekeeping and most general repairs High quality Extension adapters are made of heat treated chrome vanadium steel with a black oxide coating. Adapters and reducers are premium high strength chrome steel with a phosphate coating manganese to help resist rust and corrosion. a lifetime of use. Widely application Fits quick change 1/4 inch chuck systems or directly into drill chuck. Any cordless electric drill in a nut driver. Convenient for fast driving of nuts, bolts and fasteners, etc. The spring loaded ball bearing on the head holds the bushings properly. Color: Black Functionality: 1. Color coded for easy recognition. 2. Spring loaded ball for secure grip retention, so sockets snap into place and do not slip. 3. 1/4 inch hex shank prevents stripping during high speed drilling operation. 4. Very strong heat treated chrome vanadium steel for normal use and impact 5.Fits sockets to drills and drivers, turns any electric or cordless drill into a nut driver. 6. Converts all electric drills to gear drivers. 7. Use with a hand-held screwdriver or a battery or power tool.