Aluminum alloy Long Arm: The 1.5" ball double socket arm with an overall length of 9.1"(230 mm) Powerful Clamp:The C size 1.5" ball long arm capable of supporting up to 15.5 lbs at rest and 4.5 lbs in motion, while allowing for 360-degree rotation. Sturdy & Durable: The C size 1.5" ball long arm is made of heavy duty solid aircraft-grade aluminum alloy with powder-coated to resist high salt water corrosion. Wide Application: Compatible with RAM Mounts & Xik all 1.5"(38.1 mm) ball mounting base components Universal Compatibility: Compatible with other 1.5" ball device holders, such as: fish finder mounts, chartplotter mounts, navigator mounts, tablet mounts, marine electronic mounts, depth finder mounts, etc. Aluminum alloy 1.5" Ball Double Socket Arm, 9.1"/23cm Length Aluminum Alloy Long Arm,Compatible with RAM Mounts C Size 1.5" Ball Components, for Fish Finder Mount, Marine Electronic Mount