TEKTON WRN53006 Ratcheting Combination Wrench, 5/16-Inch 6-point box end snugly fits hex-shaped fastener heads and resists slipping off while you work Box end opening is designed to grip flat sides of fastener heads, not corners, to prevent round-off 72-tooth ratchet gear needs only a 5-degree working swing arc Open end is angled 15 degrees so the wrench can be flipped over to engage fasteners twice as often in tight spaces