RAM Mount Medium Tough-Claw Base w/Double Socket Arm & 1.5" Round Base Adapter [RAP-404-202U]Medium Tough Claw Base w Double Socket Arm & 1. 5" Round Base Adapter The RAP 404 202U consists of the small Tough Claw base, double socket arm and round base adapter. The RAM Tough Claw is the perfect mounting base for quick and easy tool less installation and removal on round, square, odd shaped rails and bars. The Tough Claw can be clamped on rails from 1" 1. 875" outer diameter. The round base adapter contains the industry standard universal AMPS