PATENTED DESIGN: 'O' silicone seal is sleeved in the groove on the connector and capable of abutting against the inner wall of the baluster in a sealed manner. Substantially reduces corrosion (inner wall) waggle and self-rotation (if round).  50 connectors for installing 25 round balusters (diameter 3/4'). Engineering nylon + fiber glass + Anti-UV materials used for advanced weather resistance.  50 stainless steel screws are included with high hardness property standard: Class 12.9. No more stripping. Surface treatment: Dacromet black coating.  Secure balusters to the rails tightly without drilling holes. No chips dust noise and danger. Create a hidden clean look to railing.  Work with composite wood and aluminum railings. Fast to install. Compatible with most deck baluster brands....