Our Swingarm extensions that we manufacture to fit Honda CBR 600 models are the highest quality billet aluminum Bolt On Swingarm Extensions available. Large 3/8 stainless steel fasteners are included - eliminating rusting and bending. These Swingarm Extensions stretch your motorcycle swingarm from 4 1/2 to 9 inches. Proudly made in our Hendersonville, Tennessee - U.S.A. facility, using 100% American made aircraft grade 6061 billet aluminum and backed by our best in the industry lifetime warranty, we guarantee quality and safety in every set we sell.