Ram Mounts RAM Trolling Motor Stabilizer with Strap Hose Clamp - A must for any angler with a bow mount trolling motor. The trolling motor stabilizer will take every bit of the vibration out of your trolling motor while all the time protecting the head, shaft and mount from damage. A must for any angler with a bow mount trolling motor. Long Arm - 12in H Medium Arm - 9in Clamp Range Rails: 1in - 2.1in diameter Universal AMPs hole pattern hole pattern: 4-Hole AMPS: 1.181in x 1.496in 3-Hole 120-Degree: 1.812in Diameter Hardware included: (1) #20 Worm Drive Strap Clamp (1) #28 Worm Drive Strap Clamp (1) 6in Rubber Strip Marine-grade aluminum