The original adjustable wrench, made by the world-famous Crescent® brand Laser etched scale in both SAE and metric sizes allows easy fastener size identification Larger knurl provides a tighter jaw fit, is easier to adjust and is less likely to bind up Hex jaw design reduces slippage by gripping fasteners tightly Heat-treated forged alloy steel for toughness and durability Tension spring stabilizes jaw and allows easy knurl adjustment Ergonomic handle increases comfort and reduces fatigue Black oxide finish resists corrosion.