PJS billet drive coupler sets are designed to provide reliable performance, excellent strength, and the highest degree of precision offered anywhere in the industry. Our manufacturing standards are unrivaled in the PWC industry with our AS9100C Quality Control System (Aerospace Standard), you are guaranteed perfect parts every time. Parts are inspected on state of the art coordinate measuring machines (CMM's), and portable inspection equipment like our brand new Romer Arm. You can shop for cheap parts or you can buy PJS quality at a fair and reasonable price, as the saying goes, you get what you pay for and we only make quality parts at PJS. Sold as a set of 2 couplers. This set fits all Kawasaki 650 skis, 92-93 Kawasaki 750's, these have skis with 18mm threads.