The Ringmaster (PATENTED) is a round sheet plastic. What separates the Ringmaster from the rest is the patent pending metal ring formed into the outer edge of the plastic. This will simplify, shorten time and can reduce your cost of check socket fabrication (no more cutting and clamping) and reduce your material costs. The Ringmaster also provides you with a very uniform pull due to it's round shape and it is made out of Bulldog®'s special check socket material providing you with excellent durability and clarity.