- Durable and sturdy: Made of high quality Cr-Mo steel; drop forged and heat treated with a black corrosion resistant finish. Stain resistant and rust resistant. Designed to withstand high torque from your impact wrench with minimal risk of damage to bolts and nuts. - Drive size and sizes: 1/2 inch drive. Long sleeve length: 78 mm (3.1 in). Metric sizes included in the long sleeve: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 21 mm, 22 mm, 24 mm, 27 mm. Short sleeve length: 38 mm (1.5 in). Metric sizes included in the short sleeve: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm, 30 mm, 32 mm. - Convenient and easy to use: 6-point flank drive design grips fasteners more tightly on the flat sides and prevents rounding off at corners under high torque and hammering stress with use of impact and electric wrenches. Compatible with pneumatic, electric and cordless impact wrenches. Comes with heavy duty storage for easy and convenient transport and storage. - L shape extension breaker bar: L shaped extension bar features spring-loaded ball bearing that secures loaded sockets, allowing you to apply maximum torque in tight spaces. The long arm provides flexibility for tackling 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. - Applications and scenarios: - Automotive repair and maintenance, including removing stubborn bolts and rusted fasteners with an impact wrench. - Working in tight engine bays or behind suspension components where the L shape extension bar provides reach and leverage. - General machinery maintenance and home workshop projects requiring a broad range of metric sizes and reliable impact sockets for cordless or pneumatic tools.