The Crescent RapidRench from Cooper Group is an adjustable ratcheting socket wrench replaces 38 of the most popular socket sizes and also fits hundreds of SAE, metric and other types of fasteners. A dial adjusts the jaws to the exact size of a fastener, with a capacity of 1/4 to 7/8 inch, and the reversing feature lets you tighten or loosen the fastener with the flip of a switch. The 60-tooth ratcheting mechanism gives the tool a truly fluid feel and exceptional speed.