Thrashin Supply Riser Extensions Dial in your bar height without a whole new set-up with the riser extensions from Thrashin Supply Company. These spacers are designed specifically to work with Thrashin Supply Company risers and are available in 1/2 or 1 heights. Features 6061 Aluminum construction Triple nickel chrome Includes longer mounting bolts Sold as a pair Note: Not compatible with Thrashin Supply Holeshot Risers.