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The Swivel Mega Coupler will fasten from (1-1/4" Pipe) 1.66" OD to 2" OD truss tube, and can be locked into a 90 degree fixed coupler by adding an optional 7/32" x 2" spirol pin. While called a Swivel Mega Coupler it is also known as a Scaffolding Clamp, Swivel Clamp, Tubing Clamp, Chesboro, Chesborough, Cheesburger, or Burger.