TEKTON WRN76009 Flex-Head Ratcheting Box End Wrench, 11/16-Inch x 3/4-Inch Box end heads pivot 180 degrees to easily get around obstructions 6-point box ends snugly fit hex-shaped fastener heads and resist slipping off while you work Openings are designed to grip flat sides of fastener heads, not corners, to prevent round-off 72-tooth ratchet gears need only a 5-degree working swing arc