Bronze, like stainless steel, is very strong and highly resistant to corrosion. By making the body of the rigging screw in chrome plated aluminium bronze and the terminals in high grade marine stainless steel, we have reduced the risk of the thread seizing up under heavy loads. A design feature which gives you a product that performs better and lasts even longer. All Seldén rig screws are locked with split pins through the threaded terminals. A safe and proven method.