MaterialHigh-carbon steel, High quality material to avoid broken during the usage. General UsageThese extensions, adapters, and reducers are designed for Impact use and feature spring-loaded detent balls to securely latch sockets, while the through-holes in the drive end of the adapters and reducers lock onto the drive tang Provides versatility and convenience no matter which tool you chose to use. Great for the DIY, household maintenance, and most general repairs, not for industrial work. A great tool addition to any tool box set. High QualityThe extension adapters are made of heat treated Chrome Vanadium steel with a Black Oxide coating, and the adapters and reducers are made from high-strength, premium Chrome Moly Steel with a Manganese Phosphate coating to help resist rust and corrosion and ensure a life time of use. Widely ApplicationSuitable for Quick Change 1/4-Inch Chuck Systems or Directly into Drill Chuck. Any power cordless drill into a power nut driver. Handy for Fast Driving of Nuts, Bolts and Fixings, etc. Spring Loaded Ball Bearing on Head Holds Sockets Securely.