Crescent Adjustable Construction Wrenches feature a round， tapered tang for easy alignment of bolt holes. A large knurl allows for easy adjustment and a tight-fitting hex jaw design reduces slippage and tightly grips the fastener for solid， secure operation. Tension spring stabilizes jaw and allows easy knurl adjustment. Proportioned dimensions optimize strength and minimize weight. Heat-treated forged alloy steel for toughness and durability. Laser etched scale in both SAE Standard and Metric sizes allows easy identification. The corrosion-resistant black oxide finish helps prevent rust. This is the ideal wrench for any iron or steel worker's tool box.