Since the introduction of the original Crescent wrench in the early 1900s, the Crescent brand has become synonymous with adjustable wrenches. The second generation adjustable wrenches boast a wider knurl for easier adjustment and a laser etched scale on the head providing a quick and convenient way to determine fastener size. Manufactured from alloy steel with a black Oxide finish to resist corrosion Allows the wrenches to be used in professional and industrial settings, as well as at home. The wide jaw capacity allows each tool to work with more fastener sizes and the wider handle provides better comfort and less stress on the users hand. The larger size wrenches, 15 in. , 18 in. , And 24 in. , have tapered handles allowing for a better two-hand grip and less weight.