1'' inch Spike Risers for Yamaha V-Star 650 Classic Custom Silverado Road Star CHROMED Hole Diameter: 1" Width: 1 3/4" Total Height: 5 1/4" Height from bottom to center of hole: 2 1/4" Bottom Thread Mount: 10mm Coarse,Bolts included: 10mm Coarse Thread 2 3/4" Length,,THIS SET IS MADE FOR 1 INCH HANDLEBARS ONLY,These are aftermarket risers and will not fit on some models,Inspect your bikes design and determine if these will fit before purcashing.,Bolts included - 10mm Coarse Thread 2 3/4" Length,Use the measurements above to determine if the risers will fit,No Installation guide