Ratcheting box-end needs as little as 5 degrees to move fasteners. 13 locking positions with flexible head. One finger operated lever with options of locking or not locking positions. 15 percent longer than current flex head ratcheting wrenches. Surface Drive Plus provides stronger grip on fasteners Locks in 13 different positions and features locking or not locking options for extreme access and versatility. Up to 37% longer than similar styles - extra leverage and easy access to those hard to reach fasteners. Surface Drive Plus on open end minimizes fastener rounding and tip spread. One finger operated lever in center of beam will not accidentally unlock during use. Includes: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"