RAM is the revolutionary universal ball and socket mounting system that allows you to mount practically anything anywhere. Attach the 1in RAM base to your round rail or Hobie Island Aka. Simply tighten the strap onto your round rail/aka using the screw provided. Once the base is securely attached, you can easily mount any of your RAM accessories onto the 1in ball. The V Base will attach to rails/bars that are 1in to 2.1in in diameter. RAM V-Base 1in (Strap 1in - 2.1in), Model Year: 2019, Product ID: 335263, Model Number: 72023029, GTIN: 0792176701415