The Hobie H-Rail Cup Holder attachment keeps your drink safe and secure on the Hobie H-Rail. The cup holder has a small piece inside so it will hold small bottles and cans up to a large Nalgene bottle. It clamps to the 12-sided H-Rail without any drilling or tools needed. When the clamp is secured, the cup holder does not twist or slide along the rail. Loosening the clamp allows you to remove the accessory or slide it along the length of the rail. Fits the H-Rail on all 2015 Pro Angler 12, 14, and 17 kayaks.