Premium Wheel Protector Socket: 1/2 in. drive 21mm 6-point thin wall wheel protector socket for professional and industrial applications 6-Point Design: Six-point geometry provides maximum contact with fastener flats, reducing rounding and delivering superior torque transfer CR-MO Alloy Steel: Constructed from high-strength chrome molybdenum alloy steel for maximum durability under high-torque impact use Impact Rated: Designed specifically for use with impact wrenches and pneumatic tools Lifetime Warranty: Backed by SUNEX Tools lifetime warranty with no exclusions Precision Fit: Machined to exacting tolerances for secure fastener engagement and reduced slippage Dual Size Markings: Features high-visibility laser-etched markings for quick identification even in low-light conditions Black Phosphate Finish: Industrial black phosphate coating provides excellent corrosion resistance for long service life Performance & Safety: Designed and manufactured to meet or exceed ANSI and ASME standards for impact sockets ensuring reliable, safe performance