Features and Benefits:

• Socket is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job
• Forged from the finest chrome-molybdenum alloy steel, the best choice for strength
• Radius corner design extends the life of fasteners; design drives the side of the fastener instead of the corner
• Design also avoids rounding of rusted or damaged fasteners

This is an impact socket and it is 12 mm. It is 1/4 in. deep and magnetic. Socket is black oxide finish and has etchings for identification.