13-Piece METRIC Standard CR-MO Impact Socket Set Designed for professional mechanics and serious DIYers, this impact socket set delivers superior strength and wear resistance through its heavy-duty Chrome Molybdenum (CR-MO) construction. The 6-point design maximizes contact with fasteners to reduce rounding under high torque. This set covers a wide spectrum of fractional sizes including 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 21 mm, 22 mm and 27 mm. Finished with a durable black coating for rust protection, these sockets are built for long-lasting performance in demanding work environments.