These risers are forged from 6061-T6 aluminum for superior strength Drilled and tapped for 1/2"-13 riser bolts (bolts sold separately) CNC-machined for precision fit on handlebars with a 1" diameter clamping area Designed to fit applications with 3-1/2" on-center mounts and will accept most OEM-style top clamps with offset mount holes. RISERS PULLBACK 4.5" BLK