Hobie Ram Ball /H-rail 1.5" Ball 1.5 in. Ram Ball allows you to attach Ram Ball mounted accessories to the Hobie H-Rail Add or remove the Ram Ball without the use of tools Clamp secures the mount in place without any twisting or sliding Attaches to the H-Rail on Hobie Pro Angler 12, 15 and 17 kayaks Also available in 1 in. Ram Ball