GearWrench 85710 5/16-Inch XL Locking Flex-Head Ratcheting Combination Wrench 13 locking positions with flexible head One finger operated lever with options of "locking" or "not locking" positions Ratcheting box-end needs as little as 5 degrees to move fastener VS. 30 degrees for standard box end wrenches 15% longer than current Flex Head ratcheting wrench to increase length to access those hard to reach fasteners Surface Drive Plus provides stronger grip on fasteners, nearly eliminating fastener rounding