This 21mm bi hexagon socket with 3 8 square drive is the largest in the elora metric range, providing maximum capacity for substantial fasteners on commercial vehicles, heavy machinery, and industrial equipment. The 21mm size is commonly specified for wheel nuts on larger vehicles and heavy duty mounting applications where significant torque is required. Manufactured to professional standards from chrome vanadium steel, this socket is expertly hardened and tempered to deliver exceptional strength and durability under demanding conditions. The chrome plated finish ensures lasting corrosion resistance, whilst the chamfered end design allows for positive nut location and smooth entry. The integrated hole accommodates a spring loaded ball bearing for secure retention. Features and benefits bull 21mm bi hexagon socket size for maximum capacity applications bull 3 8 square drive fits standard drive tools and accessories bull chrome vanadium steel hardened, tempered and chrome plated for corrosion protection bull chamfered end facilitates reliable fastener engagement contents bull 1 x elora bi hexagon socket, 3 8 sq. Dr., 21mm