12mm and 13mm box wrench combo fits many applicationsForged steel with satin chrome finish is ultra strong and durableSix point box ends maximize surface contact and reduce risk of damaging sprocket nutsOffset design and long arms provides clearance over sprocket and protects handsWill not work on Tusk hubs or some aftermarket wheelsBox wrench end requires 7.6mm (0.3") of space between the spokes and sprocket bolt end to access the sprocket nutManufacturer's limited lifetime warranty