DROPOUT 351, GT - GT. - CNC machined 6061 aluminum. - Black anodized finish - Attaches to frame with (1) M4x16 Flat head screw and (1) M4-16 socket head screw. - Fasteners not Included. - For Shimano Direct Mount derailleurs. - Replaces GT part #KG0007N02. - 1 drop out per bag.