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Everbilt 3/8 in. W x 1/2 in. H x 96 in. L Aluminum C-Channel with 1/16 in. Thick 800547 - The Home Depot
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C6X13 18 Gauge 20mm Slotted 3 Inch Black Metal 1 0.1 U Channel Steel Galvanized 150X75X6 125X65X6 100X50 C Steel Channel Purlin - China Channel Steel, C Channel Purlin | Made-in-China.com