Reliable Hardware Company RH-1174-4-A Road Case Aluminum Tongue and Groove Extrusion, 1/4-Inch Break Apart - 4-Foot Section .30'' Channel Width 1.87'' Exposed Surface 6063 Aluminum Extrusion Mill Finish For use with 1/4'' Plywood + 0.040 ABS Laminates Cut to Desired Length and Break Apart