72-tooth ratcheting box end needs a minimal 5° to move fasteners vs. 30° for standard wrenches; Off-corner loading design on box end provides better grip and reduces fastener rounding; Thin head and beam provide greater access in confined work areas; Size conveniently stamped on both ends of the beam for quick identification; Manufactured from alloy steel for better strength and longer tool life; Bright, full polish chrome finish easily wipes clean and resists corrosion; Meets or exceeds ASME and ANSI specifications