This button fits both square tube and round tube.
Round Tube – Minimum .590″ inside diameter up to Maximum 1.250″ inside diameter.
Square Tube – Minimum .490″ inside dimension up to a Maximum 1.250″ inside dimension.
HD DIA. = .312″ Dia. Button
HD HGT. =.375″ Button Height
Material Thickness = .020″ thick
Material Width = .440″ wide