IRWIN IMPACT Performance Series Deep Well Socket 11 Piece Drawer Set SAE With 3/8" Drive (1877482) IMPACT performance series bits are designed specifically for impact drivers and the higher torque they produce. 6-point deep wells with recessed corners drive torque across the flats for a more secure fit, eliminating movement and extending the life of the bit. Made with heavy-duty chrome molybdenum steel for maximum durability. The black oxide finish resists corrosion. Thin wall construction allows easy access to tight spaces. Socket size is clearly identified with large, permanent, laser-etched markings. Molded ABS resin case holds up to rigors of daily use. Compact, flat design allows for convenient storage in drawers and tool cabinets.