BEAM-BLK / Deluxe Post Cross Beam – Black Products » Gaines » BEAM-BLK / Deluxe Post Cross Beam - Black BEAM-BLK / Deluxe Post Cross Beam - Black $79.00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 20 25 30 40 50 75 100 Keystone Series Deluxe Post Horizontal Cross Beam. Black powder coat finish. Cast aluminum. Includes mailbox mounting plate.