Wheelchair Heavy-Duty Clamp Mount with Dedicated Cradle for iPad Pro 12.9" 3rd & 4th Gen (sku 57069)Wheelchair Heavy Duty Clamp Mount with Dedicated Cradle for iPad Pro 12. 9" 3rd & 4th Gen This wheelchair mount offers a greater flexibility in viewing positions for your iPad. The 8 inch ratchet arm offers the ability to maneuver the mount find the best angle. The short 2. 5" extension arm then offers further adjustment to find the best position to view your tablet. The heavy duty clamp mount base will clamp bars from . 625 to 1. 5 inch (1. 58 3.