The F3 Mounting Option for the 4x4 Equip Safety Flag Pole utilizes U-bolts to secure the mounting plate to the upright tubular wing sections of your bullbar. (The U-Bolts suit a 48mm diameter tube.) When required the Safety Flag Pole is simply screwed onto this mounting via the threaded base.
This mounting is the prefered option for commercial and mining operators as it can be attached to the roll-cage of most light vehicles.