The P1985S Unistrut Beam Clamp allows you to securely connect a section of Unisturt Channel to an i-beam or other structural beam support. One 1/2" - 13 x 1-1/2" set screw is included. The beam clamp can be used on flanges with thicknesses up to 3/4". These beam clamps come in a box of 100 pieces (62 pounds). It's available in either a Perma-Green or Electrogalvanized finish.