Sunex 428zt 3/4-Inch Drive 7/8-Inch 12-Point Thin Wall Impact Socket Forged from the finest chrome molybdenum alloy steel  the best choice for strength and durability Radius corner design - to extend the life of fasteners The design drives the side of the fastener instead of the corner 3/4-Inch drive 7/8-Inch, 12 point thin wall impact socket