Super-Strut 3” 702 Pipe Rigid Steel Conduit Clamp Complete NOS USA 277F.
 
 
Some of them are just another company or color but all are the same size. New old stock complete with nut and bolt.
 

This Super-Strut 3" 702 Pipe Rigid Steel Conduit Clamp Complete is a high-quality product manufactured in the United States. It is designed for use with rigid metal (RMC) conduit and is available in many colors. This unit type bracket mount is made of steel and has a compression connection type. The accessory type of this product is conduit clamps, and it is perfect for use in conduit fittings, conduit & tubing, wire, cable & conduit, electrical equipment & supplies, and business & industrial. The flexibility of this product is rigid, which ensures maximum stability and support.