SMT MOTO- 1" (inch) Chrome Handlebar Risers Handle bar Riser for Suzuki Intruder Volusia Marauder 1600 Boulevard C50T C90 Motorcycle High Quality Chrome Billet Handlebar Risers Min Diameter:3.2cm?Max Diameter:4.9cm?Hole Diameter: 2.5cm (1 inch) Total Height: 18cm?Height from bottom to center of hole: 15cm?Pull Back: 3.8cm?Bottom Thread Mount: 0.5 inch Coarse x 13 (13 threads/inch) Bolt Condition: 100% Brand New ,Quantity:1 Pair (2 PCS),No include install instructor This set is made for 2.5cm (1 inch) handlebars only