The large bar mounting base comes with four soft rubber ring inserts that provide a snug fit and protect the mounting surface. Rubber ring insert diameters: 1.5" (38.1mm), 1.65" (41.91mm), 1.75" (44.45mm), 1.85" (46.99mm). The rubber ring can be increased or decreased according to the diameter of the round rails. The tube clamp mount have a 2" (50.8mm) diameter mounting hole without the rubber ring insert.
So, the roll bar clamp mount accommodates roll cage 1.5 inch (38.1mm) / 1.65 inch (41.91mm) / 1.75 inch (44.45mm) / 1.85 inch (46.99mm) / 2 inch (50.8mm) in diameter. An Allen key is included with the package to facilitate your installation. Perfectly suited for mounting on the UTV roll cage, ATV roll bar, motorcycle bull bar, or even on kayak rails and large handlebar.