For heavy-duty QUICK TRAY PRO applications. Mounts on 1-5/8-in. wide metal channel. To secure tray to bracket, use one QTPSSW3/QTPSSW3BLK Splice Washer and one QTPBNWK/QTPBNWKBLK Splice Kit on sizes up to 8 in. (203 mm), use two on 12-in. (305-mm) and wider trays. Made of plated steel for corrosion resistance.