Armstrong 33-088 Offset Striking Wrench 2 3/4 in. Striking box-end wrenches have an offset handle that allows access to fasteners in tight spaces. A block shape on one end of the handle is struck with a hammer to loosen or tighten a fastener. Wrenches are SAE (inch) size with an opposite end having an enclosed head end (box end) that fits around the entire head of the fastener for a more secure grip while turning compared to an open end. The 12-pt. design has additional grooves that make it easier to connect with the head of the fastener and connect at more angles for better accessibility compared to a 6-pt. wrench.