These are Schumacher Racing Products factory replacement 5.5mm long ball studs for the Cat PB platform. The metal ball studs feature a hex socket drive and are sold as a pair. They are a direct-fit suspension component designed to maintain proper linkage and pivot geometry on the Cat PB 4x4 buggy. Features: 5.5mm ball diameter, long length Hex socket drive head Metal construction Sold as a pair 7/7/26 cs