Racing Axle Block Blue for Yamaha YZ450FX 2016-2019

Bolt slot design to hold Rim precisely in place while tightening the chain. Requires the use of only one 10mm open-end wrench to make chain adjustments. Lightweight design made from billet 6061-T6 aluminum and anodized. Clear, easy to see adjustment marks to ensure proper Rim alignment. Sold in pairs.