Internal fitting for 38.1mm round tube. The elbow can be adjusted from 90 to 180 degrees. Precision cast from high quality S316 marine grade stainless steel for maximum corrosion resistance and durability. Simple to install with pop rivets or glue. Designed to allow angle changes for 1.6mm wall thickness handrail tube, such as between landings and stairs, or between 1.6mm thick posts and the handrail at the bottom of stair runs.