Striking box-end wrenches have an offset handle that allows access to fasteners in tight spaces.
They have a block shape on one the end of the handle that is struck with a hammer to loosen or tighten a fastener.
Wrenches are metric 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.
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.