XCAN Drive Deep Impact Sockets 8-20mm Air Pneumatic Socket Wrench Head Standard Durable Car Auto Truck Repair Tools Features: Long Service Time -- High strength impact grade 45 steel sockets withstand more torque from impact tools and ensure longevity. Premium black oxide finish provides maximum protection from rust and corrosion. Enhance Stable Design -- Concave 6-point hex socket design grips the flat sides of fasteners, not just the corners, preventing round-off deterioration under high torque and hammering stress when used with impact and electric wrenches against fasteners. Visible Size Code -- All deep impact sockets are engraved with size mark for quick identifies drive socket specs and measurements. Specification: Color: Black Material: Steel Size: 8mm,9mm,10mm, 11mm,12mm, 13mm, 14mm, 15mm,16mm, 17mm,18mm, 19mm, 20mm,21mm, 22mm. Package include: 1pc of Sockets