SMALL BASE + EXTERNAL BEAKE + 100mm REFLEX + LARGE INTERNAL REFLEX BRAKE. BBG - NF#2 - O17SUGESTED CALIBERSelectADDED LENGTH (mm):175OVERALL LENGTH (mm):277DIAMETER (mm):50WEIGHT (g):645COMPONENTS SelectTHREADM12 X 1 M13 X 1 M14 X 1 M16 X 1 M18 X 1 & IMPERIAL