Bolt Motorcycle Hardware (CHAD-CR.RD) Red Chain Adjuster Block Fits: Honda CR125R/250R 00-07; CRF250R/450R 02-14; CRF250X/450X 04-14 The innovative Billet Aluminum Chain Adjuster Blocks hold your wheel precisely in place while you tighten your chain Unique design features an integrated bolt slot so your blocks stay in position even when the axle is removed, making your chain adjustments requires only one 10mm wrench Each anodized 6061 aluminum block has permanently laser etched aligning marks and are placed so that only one mark engages at a time making aligning a snap Fasteners have anti-seize compound pre-applied to the threads