The Brito 21mm Impact Socket is a specialist tool designed for square-section wheel nuts, featuring a 3/4" square drive for use with heavy-duty air wrenches. Manufactured from premium chrome vanadium steel, hardened and heat-treated for durability, this socket is precisely engineered with tight tolerances to prevent slipping and cam-out on impact. Ideal for automotive technicians, fleet maintenance, and industrial workshops requiring reliable, non-warping performance under high torque.