It is made up of polished 304-grade stainless steel, corrosion resistant and durable, the cable is coated with Nylon, super sturdy and long-lasting, used with Bimini boat tops, and slideable springs for easy changing on different sizes. The spring-loaded ball in the tip of the pin holds it in place, strong against a vertical pull as a hinge, but comes out cleanly with a sideways pull. Widely used in various shipbuilding, ship outfitting, deck fitting, quick-release ball pin for boats, Bimini top, deck hinge, etc. Dimensions: Diameter: 5/16”, Grip: 1-1/2”, Total Length:5.9”(150.0mm), Pin with retractable ball Length: 2.09”(53.0mm). Package Includes Pack of 4 Marine City 304 Grade Stainless Steel Boat Bimini Top Quick Disconnect Pin with Cable.