Our Big Twin Clutch Baskets are CNC machined from the highest quality aluminum forgings. This means improved quality control and precise fitment. We coat them with Mil-spec. hard-anodizing for maximum durability and strength. Available in 36 and 37 tooth sprocket configurations to make many different gearing combinations possible. Ring gears are available in 66, 84 and 102 tooth configurations. Matching pinion gear is included with 84 tooth configurations. We recommend you replace your pinion gear when installing a new ring gear to maximize service life and minimize potential for premature wear.