RAM mount kit, flat clamp base, medium arm 215mm (21,6 cm ( 8,5 inch )), D ball for dock rear, Kit includes hardware for mounting to the Thor Smart Dock, VM1001VMCRADLR, or the Marathon vehicle dock, FX1005VMDOCK, RAM ball size D" (2.25/57mm), Kit includes a flat clamp type RAM ball for the vehicle side mounting. These clamp balls attach directly to the roof support arm of most fork lift vehicles without the need for additional mounting hardware.