DROPOUT 101, CERVÉLO - CNC machined 6061 aluminum. - Black anodized finish. - Attaches to frame with (2) M4x8 Flat Head Screws. - Fasteners not included. - Replaces Cervelo part # DRH-R-2003. ~ Note: Many pre-2011 Cervelo models with a replaceable derailleur hanger use Derailleur Hanger #101. DROPOUT-45 may have been used on older frame. - 1 drop out per bag.