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 in the SUN9918MA - 5 piece Metric Full Polished V-Groove Combination Wrench Set OR the SUN9917MPRA 25 Pc. Metric Full Polish V-Groove Combination Wrench Set