Bridgeport 954 2 1/2 IN Beam Clamp, Box of 25
https://nsiindustries.com/product/bridgeport-954-2-1-2-in-beam-clamp-box-of-25/
Bridgeport Beam Clamps make quick connections to structural steel without the need for drilling or welding. Single screw clamps with two threaded holes can be used for a variety of support, lifting and rigging applications.