Tackle those hard-to-reach nuts and bolts with this Stanley Proto crowfoot wrench. It has a 3/8-inch square drive, so you can use it with any 3/8\ drive ratchet or extension. The open-end size is 2-3/16 inches. The full-polish finish resists corrosion and makes it easy to clean. Proto's anti-slip design and tight tolerance provide a secure grip on fasteners, reducing the chance of rounding them off. The locking hole helps keep the wrench firmly attached to a locking extension, which is a lifesaver when working in tight, awkward spaces where you might otherwise drop a tool. Whether you're a professional mechanic or a serious DIYer, this crowfoot wrench is an essential specialty tool for your arsenal when a standard wrench just won't fit.