20mm 0.78-Inch - Clamps for EVT100S Trussing Clamp fastens from 18mm 0.70-Inch to 20mm 0.78-Inch A broad selection of TUV Rated Clamps for Rigging or Suspending Lighting Fixtures on Trussing or Single Tubing. Our assortment of Clamps can provide you solutions for successful Theater Shows, Stage Lighting Applications, Speed Rail, Mobile DJ Events or Church Stages