175lbs, 19.5 to 38in Deep Universal Tray for 19″ AV/ Network Equipment Rack (ADJSHELF), Rackhylde, sort, 1U, 19″, for P/N: CABSCRWS1224, RK1536BKF, RK1836BKF, RK3236BKF, RK4236BKB, RK4242BK24, RK4242BK30