CNC machined from aircraft grade 6061 T6 anodized aluminum Eliminates over extended adjustment bolts Reversible design allows for quick gearing changes This product can be used with Yamaha YZ125 02-05 Yamaha YZ250 02-05 Yamaha YZ250F 02-05 Yamaha WR250F 02-06 Yamaha YZF426F 2002 Yamaha WR426F 2002 Yamaha WR450F 03-06