Elbows & Connectors: Create a stylish railing system with our wide selection of elbows & connectors. This Ball Joint connector provides a BALL mount look to your brass railing. Made of 100% solid brass this connector has a tarnish-resistant powder coated RSF finish which is maintenance-FREE & protects up to 20 times longer than regular lacquers. Fits tubing size 1 ½ in. diameter.