Longer jaws grip better, avoiding slippage or nut round off. Measurement scales (in. on front; mm on reverse) are handy for sizing nuts, pipe and tube diameters. Greater jaw capacity supports larger nuts and bolts. Thinner jaws for greater access in tight spaces. Precise jaw design grips tight the first time every time CHANNELLOCK adjustable wrench is made of chrome vanadium construction with (2NL-1CR) coating. It's designed with perfectly parallel jaw surfaces grip safely and reduce possibility of damage. NO sacrifice was made, you have comfort and durability in one! Length: 15" (385mm); Adjustments: 0 to 1-3/4" (43mm).