This is a replacement base for the Master C Stands with Turtle base. It features a zinc alloy base casting on that's five times stronger than aluminum to sustain the weight of heavy sandbags and people standing on it. The hollow junior pin receiver allows debris to pass through for easier cleaning and maintenance and the patented spring ring locking system enables you to open and close the base in under a second! It's an economical way to incorporate Kupo's game changing base design with your existing C Stand riser sections.