Bolt MC Chain Adjuster Blocks 2 Pack Green for Kawasaki KX125 KX250 KX250F INNOVATIVE BILLET ALUMINUM CHAIN ADJUSTER BLOCKS HOLD YOUR WHEEL PRECISELY IN PLACE WHILE YOU TIGHTEN YOUR CHAIN OUR UNIQUE DESIGN FEATURES AN INTEGRATED BOLT SLOT SO YOUR BLOCKS STAY IN POSITION EVEN WHEN THE AXEL IS REMOVED MAKING YOUR CHAIN ADJUSTMENTS REQUIRES ONLY ONE 12MM (13MM KTM) WRENCH EACH ANODIZED 6061 ALUMINUM BLOCK HAS PERMANENTLY LASER ETCHED ALIGNING MARKS OUR ALIGNING MARKS ARE PLACED SO THAT ONLY ONE MARK ENGAGES AT A TIME MAKING ALIGNING A SNAP