It is made up of polished marine stainless steel, electro-polished to prevent corrosion, and the grips anchor securely to any horizontal rail. It can hold up to 35 pounds and is held away from the rail. It holds securely to any horizontal rail. It is of the highest quality, preventing corrosion, and is solid, giving long-term service. Easy to install and able to set in desired angles, allowing quick release for emergencies, the design shows Dan forth and fortress-type anchors (except mud palms). Dimensions: It mounts securely to any 1 Inches to 1 -1/4 Inches vertical stanchion. Package Includes Pack of 1 MARINE CITY Vertical Stanchion Rail Mount Anchor Bracket (Fits 1" to 1-1/4").