General description This is a 21mm bi-hexagon socket designed for 1/2-inch square drive applications. It is suitable for professional use and compatible with various tools requiring a bi-hexagon socket. Technical specifications Size: 21mm Drive size: 1/2 inch square drive Material: Chrome vanadium steel Finish: Chrome plated for corrosion resistance Standards: Manufactured according to DIN 3124/ISO 2725 and DIN 3120/ISO 1174 Compatibility and accessories Compatible with 1/2-inch drive tools Designed for use with nut drivers and ratchets Installation Insert the socket onto a compatible 1/2-inch drive ratchet or wrench Ensure proper engagement with the nut or bolt before applying torque Usage Use for tightening or loosening nuts and bolts with a 21mm size Ideal for professional and DIY home improvement tasks requiring a bi-hexagon socket Other information Professional quality, sockets manufactured from chrome vanadium steel hardened, tempered, and chrome plated for corrosion protection