The RoadVise Clamp Mount with 20mm ball is designed for wide-range clamping. The heavy-duty mount is made of high-strength composite materials with corrosion-resistant stainless-steel hardware. The clamp mount opens to 2.75" diameter to securely grip roll bars, tubes, handlebars, warehouse carts, etc. The 20mm ball (0.78") is compatible with 20mm (0.78") shafts. 
Arkon
Velocetech
