studioegg 
Consisting of fitting, setting screw, suction cup.
φ10, 15
Attach the cup directly to the fitting
φ20～50
Attach the cup to the fitting with setting screw
φ75～150
Screw the fitting directly to the cup
φ75：
Screw the fitting
directly
into the female screw in the cup
φ110～150：
Mounting
by bolts
those are attached
to the fitting