CNC Rear Chain Adjuster Axle Block for KTM SX SX-F XC XC-F 125 250 350 450 530 HUSQVARNA TC125 FC350 FC250 FC450 2016 Motocross Off Road Dirt Bike (Orange1) Lightweight design made from billet 6061-T6 aluminum and anodized orange. Clear, easy to see adjustment marks to ensure proper wheel alignment. Reversible design allows axle to be extended without running adjustment bolts all the way out, increasing strength. Sold in pairs. High quality and easy to install