DROPOUT 148, BIANCHI - Bianchi. - CNC machined 6061 aluminum. - Black anodized finish. - Attaches to frame with (2) M4x8 Flat Head Screws. - Fasteners not included. ~Note: M4 holes on DROPOUT-148 are threaded! Frames using this hanger will not have threaded holes in the frame. Use DROPOUT-61 for the same shape hanger, but with counter sunk, non-threaded fastener holes. - 1 drop out per bag.