BCC impact sleeves are made of chrome vanadium steel. Each of these socket adapters features a hardness-enhanced die-cast body that is rust and corrosion resistant, and is equipped with ball bearings. Easy-to-use screwdrivers, the handy tool perfect for hard to reach corners and tight spaces, with a maximum torque of 77Nm This adapter kit is designed to provide a secure locking extension to your existing tools. The adapter kit socket adapters includes 3 pieces: 1/4" - 65mm, 3/8" - 65mm and 1/2" - 73mm. Suitable for screwdrivers or power drills or tools with screwdriver handles Featuring a hex hole or 3-jaw chuck, they can be attached to drills, cordless drills or hand wrenches, extending to narrow, curved screws, nuts, etc. that are hard to reach. For screwdrivers or power drills or screwdriver handle tools with hex holes or 3-jaw chuck, they can be re attached to drills, cordless drills or hand wrenches, extending to narrow screws, bends, nuts, etc. difficult to reach.