Features and Benefits: Radius V-Groove design creates an anti-slip and prevents rounding of the fastener.; Box end is offset by 15 degrees to provide clearance for your fingers and other obstructions near the fastener.; Fully polished to eliminate oil and grease build up.; Radius Corners to grip the flat sides of the fastener head instead of the corner to prevent round-off.; Chamfered box end allows for fast and easy guidance onto fasteners.; Upgraded steel from High Carbon to Chrome Vanadium for more strength and durability.Available individually or also found in the 9917MA set and9917MPRA set.