- Durable and sturdy: Made of high quality Cr-Mo steel; drop forged and heat treated with a black corrosion resistant finish; stain and rust resistant; designed to withstand high torque from impact wrenches with minimal risk of damage to bolts and nuts. - Drive size and sleeve lengths: 1/2 inch drive. Long sleeve length 78mm (3.1 in) metric sizes: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 24mm, 27mm. Short sleeve length 38mm (1.5 in) metric sizes: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 27mm, 30mm, 32mm. - Convenient and easy to use: 6-point flank drive design grips fasteners tightly on the flat sides and helps prevent rounding of corners under high torque and hammering stress when using impact and electric wrenches; compatible with pneumatic, electric, and cordless impact wrenches; includes heavy duty storage for easy transport and storage. - L-shaped extension breaker bar: L-shaped extension bar with spring-loaded ball bearing secures loaded sockets, allowing you to apply maximum torque in tight spaces; long arm provides flexibility to tackle stubborn nuts and bolts. - Easy to read and identify: All deep impact sockets are engraved with size marks for quick identification of drive socket specs and measurements.