Open end is angled 15° to engage fasteners twice as often. 30 piece sae metric 12 point combination wrench set 1/4-1 in. 8-22 mm with pouch this item is in the category home & garden\tools & workshop equipment\hand tools\wrenches\wrench sets. Angled Open End To reduce the working swing arc in tight spaces, the open end is angled 15 degrees so the wrench can be flipped over with each rotation to engage the fastener twice as often.