Kickstart rubber, Norton / AMC, open end. Used on Norton 1938 +, AJS Matchless post 1951. Will fit pre -war Nortons to 1933-34. 3 1/4 inches long (80mm), 9/16 inch hole (14mm). No branding like original. Original part number B2/648, N.8081, N8081 - kickstarter crank rubber