This wrench offers extended reach in tight spaces and more torque-multiplying leverage.
Reducing 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.
A 12-point box end doubles the access angles of a 6-point and prevents round-off by gripping the flat sides of fastener heads rather than the corners. The 15-degree offset creates clearance for your fingers.