The RAM-235U consists of a double U-bolt base with 1.5" diameter ball and two stainless steel u-bolts.
The double U-bolt base will accommodate rails from 1" to 1.25" in diameter.
RAM® Double Socket Arm with Round Ball Plate
RAM® Double Socket Arm with 75x75mm VESA Plate
RAM® Double Socket Swivel Arm
RAM® Composite Double Socket Arm
RAM® Double Socket Arm
RAM® Double Socket Arm with RAM® Pin-Lock™ Security Knob
RAM® Flex-Arm™ with 18" Aluminum Rod and Two Single Socket Arms
RAM® Stainless Steel U-Bolt Hardware Pack for Rails 1" to 1.25"