R-Joints are a revolutionary rod end design that provides low friction, full range articulation, long service life, lateral stability and a quiet operation. They articulate in 3 planes, 360 degree axial rotation and 30 degrees of total lateral rotation. The R-Joints are a 17-4 investment cast stainless steel housing with rolled threads and polished stainless ball and RTX10 composite cage provides consistent low friction movement. The special RTX10 composite cage needs NO lubrication. This self cleaning designs movement is not affected by ANY water, grit, dirt, or debris. The spring loaded closure keeps the mechanism tight and rattle free for LIFE!