These risers are forged from 6061-T6 aluminum for superior strengthDrilled and tapped for 1/2''-13 riser bolts (bolts sold separately)CNC-machined for precision fit on handlebars with a 1'' diameter clamping areaDesigned to fit applications with 3-1/2'' on-center mounts and will accept most OEM-style top clamps with offset mount holes