Premium Material: The Pneumatic Extended Socket Set is made from heat treated chrome vanadium steel, and the surface is treated with black phosphorus for wear resistance and durability.10 Pieces Set: Includes sockets of 8-24mm specifications to meet the needs of daily maintenance work. The 1/2 hex socket models are 8/10/12/13/15/17/19/22/24mm.1/2" Socket Wrench Adapter: The Electric Wrench Socket Set is designed for use with a 1/2" impact wrench.Storage Box: The storage box has designated slots to keep each item in place, preventing them from falling out and providing a more secure to reduce wear and avoid impacts of corners.Pin Positioning Design: After installing the socket, insert the positioning pin and then put it on again so that the socket is firmly fixed on the wrench. This can be used for car repairs, equipment installation, etc. Size Chart: Storage Box: 29cmx10cmx4.5cm/11.42inchx3.94inchx1.77inchWrench Socket Length 78mm Package Includes: 10Extended Socket1 Storage Box Note: 1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.