Sturdy and Heavy Duty - The weight capacity of the double socket arm can be up to 15.5 lbs at rest and 6.6 lbs lbs at motion. Superior Compatibility - The overall length of this arm is 3.35" (85mm). Attaches to any 1.5 inches / C size / 38mm ball component, including mounting bases and device holders. All of our components are compatible with RAM Mounts as well as 1.5" ball systems, compatible with Arkon, iBolt and more. Constructed of Powder-Coated Marine-Grade Aluminum and Stainless Steel Hardware. The mount has been Salt Spray Tested for thousands of hours (including stainless steel bolts and springs) to resist high salt water corrosion. 360 Degree Rotation - Attach 1.5 inches ball accessories for near-infinite adjustability for optimal viewing angle. Made of Powder-Coated, Marine-Grade Aluminum for durability and reliability in the most demanding environments. The overall length of this arm is 3.35" (85mm). Attaches to any 1.5 inches / C size / 38mm ball component, including mounting bases and device holders. All of our components are compatible with RAM Mounts as well as 1.5" ball systems, compatible with Arkon, iBolt and more.