Sunex 312z 3/8-Inch Drive 3/8-Inch 12-Point SAE Standard 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 3/8-Inch drive 3/8-Inch, 12 point SAE standard impact socket