LARGE BASE + STD FRONT CAP + 200mm REFLEX + STD INTERNAL REFLEX BRAKE BBG - NF#2 - O51SUGESTED CALIBERSelectADDED LENGTH (mm):234OVERALL LENGTH (mm):435.5DIAMETER (mm):50WEIGHT (g):825COMPONENTS SelectTHREADM12 X 1 M13 X 1 M14 X 1 M16 X 1 M18 X 1 & IMPERIAL