Reliable Hardware Company RH-1171-4-A Road Case Aluminum Tongue and Groove Extrusion, 1/2-Inch Break Apart - 4-Foot Section .50'' Channel Width 2.00'' Exposed Surface 6063 Aluminum Extrusion Mill Finish For use with 1/2'' Plywood + 0.040 thick ABS Laminates Cut to Desired Length and Break Apart