Made with a durable Chrome Vanadium construction for long-lasting performance the 1/2" square drive 12-point metric sockets from Britools Expert come in a wide range of sizes from 8mm to 22mm. The tightening torque is applied to the sides for the fastener to help prevent sheering and rounding off allowing for efficient tightening and loosening when used with a manual 1/2" ratchet.Features and Benefits Chrome Vanadium construction for superior durability Suitable for manual 1/2" square drive ratchets Bi-Hex shape fastens to the sides of the nut helping to prevent sheering Comes with Britool Expert lifetime warranty Conforms to ISO 3315 - DIN 3122 - ISO 1174-1 standardsTypical Applications Domestic Mechanical Industrial On site Workshop WarningFor manual use only - Not suitable for power tools