Deep Impact Socket 21mm 3/4in Drive 6 Point CR-MO

A 21mm deep impact socket with a 3/4in drive, used where extra reach is needed beyond a standard socket. Made from CR-MO and built in a 6-point pattern, it is suited to heavier fastening work with either hand tools or impact equipment.

Used across garages, workshops and site repair work, a 21mm deep socket helps when nuts sit further down a thread or over longer studs. It is a practical choice for vehicle maintenance, servicing, fitting work and general trade repairs where larger fixings need proper contact and a secure drive. For mechanics and regular workshop use, the deep pattern can make awkward access jobs more straightforward.

The 21mm size suits matching fixings, while the 3/4in drive fitting makes it suitable for larger ratchets, breaker bars and impact wrenches that take the same drive size. Its 6-point design gives a solid fit on the fastener, and the CR-MO construction is commonly used for impact socket applications. Where needed, the socket can also be secured to an impact wrench using a pin and O-ring. That makes it useful for repeated workshop use, especially when the socket needs to stay firmly in place during ongoing fastening work.

Impact socket specifications

• Socket size: 21mm for matching nuts and fixings.
• Drive fitment: 3/4in drive for compatible manual tools and impact wrenches.
• Pattern: Deep socket style for reaching nuts on longer studs or recessed threads.
• Construction: CR-MO socket with 6-point design for solid engagement on the fixing.
• Retention: Can be fixed to an impact wrench by pin and O-ring where required.

A practical 21mm socket for regular maintenance and repair work.