Wiha Tools Box End Wrench Set, Alloy Steel, Chrome, Insulated Yes, Number of Tools 6, 3/8" to 3/4"

Single end ratcheting box-end wrench sets have an enclosed head on one end of the handle and provide a more secure grip on the full length of the handle compared to a double end box wrench. The single end is SAE (inch) size for use on one specific size fastener. Wrenches have a 12-pt. ratcheting box end with 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. The ratcheting box end has a gear mechanism that allows the wrench to rotate freely in one direction without removing the wrench head from the fastener and repositioning the wrench.