Use: Front Only Material: 6069 T6 (30% stronger than 6061 T6) Walls: Double Joint: Sleeved Weight: 305g, 415g Diameter: 406 (20”), 507 (24”) Drilling: 28, 32, 36 Valve: AV Sidewall: N/A ERD: 388, 489 Colors: Black, Blue, Polished, Red, Gold