Evolution Industries Complete Clutch Baskets combine our top quality billet Aluminum baskets with our Diamond Terminator Clutches to make the best clutch setup on the market. All Diaphragm Baskets come with a Light and Heavy spring. The Baskets are machined from aluminum forgings and Military spec. hard-anodized for maximum durability and strength. Available in 36 and 37 tooth sprocket configurations. Ring gears are available in 66, 84 and 102 tooth configurations. Matching pinion gear is included with 84 tooth configurations. It is recommended to replace your pinion gear when installing a new ring gear.