Set of Allen Riser Mounting Bolts for Harley-Davidson Handlebars 2 Riser Mounting Allen Boltsfor Harley Handlebars Risers2 allen Riser Mounting bolts for Harley-Davidson or any other project that requires standard 1/2 fine thread. Fine thread. Washers included. Bolts are 1/2" fine thread. 3-1/2" overall length. 1-3/4" long thread.