T-Nut 3/8"-16 x 7/16" Stainless Steel, (10 Pack) Choose Size/Quantity, by Bolt Dropper, Pronged Tee Nut. for Wood, Rock Climbing Holds.: Amazon.com: Industrial & Scientific
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TOP PLATE 4SER RIGID #1 - 4" x 4-1/2" Weld-On Caster Mounting Plate Unplated Steel