DROPOUT 337, NORCO - Norco. - CNC machined 6061 aluminum. - Black anodized finish. - Attaches to frame with (1) M4x8 Flat head screws. - Fastener not Included. - Replaces Norco Part #913015-003. ~ Note: This hanger is not the same as our DROPOUT-274, which uses an M3 flat head screw. - 1 drop out per bag.