These billet Risers take 1" handlebars, hold them at a height of 60mm (100mm also available), and are made of billet aluminium. The top surface is engraved with a pentogram. The stainless clamp bolts are hidden (supplied), and the base is tapped M12. (M12 bolts not supplied) Please note, these are top quality, precision engineered parts, made here by us, not cheap imported trash!