LARGE BASE + EXTERNAL BRAKE + 200mm REFLEX + LARGE INTERNAL REFLEX BRAKE BBG - NF#2 - O57SUGESTED CALIBERSelectADDED LENGTH (mm):253OVERALL LENGTH (mm):454.5DIAMETER (mm):50WEIGHT (g):909COMPONENTS SelectTHREADM12 X 1 M13 X 1 M14 X 1 M16 X 1 M18 X 1 & IMPERIAL