DROPOUT 16, CANNONDALE MTN 91-CURRENT - Cannondale MTN 91-current. - CNC machined 6061 aluminum. - Black anodized finish. - Includes (2) M3x10 Socket Head Cap Screws. - Cannondale Part #A239X/EBO. ~ Note: DROPOUT-16 has 14.33mm between the two holes (center to center) and 6.81mm between the two vertical plates. - 1 drop out per bag.