Features: Brand new and high quality High strength impact grade steel sockets withstand more-torque from impact tool and ensure longevities. Black-oxide finish provides maximum protection from rust and corrosion. Concave hexagonal 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. All deep impact sockets are engrave with size mark for quick identifies drive socket and measurements. Greatly improve the accuracy, save-time and convenient for operation. Specifications: Material:CRV Type:8mm/9mm/10mm/11mm/12mm/13mm/14mm/15mm/16mm/17mm/18mm/19mm/20mm Length:Approx.77mm/3inches Package Includes: 1x Pneumatic Sleeve note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.