Grrreat Creations, Inc. Clamps.
Plenty of sizes for your truck cap / rail fastening needs! The G-1 and G-1E Clamps mount to both aluminum and fiberglass rails and have a 0-1 1 / 2 " opening.
G-2 and G-2E Clamps mount only to aluminum rails and have a 0-1" opening. Models with "E" designation feature an eyebolt for easy twist closure.
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