Halex 57925 Service Entrance Mast Head, 200 Amp, 2-1/2" Aluminum die cast. Indoor or outdoor applications. Use in an overhead service entrance. Mounts on top of Rigid or IMC conduit. Serves as a connecting point for the service entrance wires. UL Approved. Tray boxed. SERVICE ENTRANCE CAPS Size In=2-1/2 FOR 200 AMP SERVICE SLIP-FIT , EA