JOKER MACHINE BRIDGE CLAMP PULLBACK RISERSThese risers give a 1 1 2" (3. 8cm) pullback with a 2 1 2" (6. 4cm) rise and are made for 1" handlebars. As they have Bridge style one piece upper clamps they are also great for Fat Bars that are reduced to 1" at the clamping area. Risers fit standard Harley Davidson upper triple trees that have 3 1 2" (8. 9cm) center to center riser holes. Risers are threaded 1 2 13" UNC and are CNC machined out of solid 6061 T6 bar stock for maximum strength.