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4 pc)3/8-16 x 5" Long Square-Neck Carriage Bolts Set w/Nuts & Washers,Zinc-Plated,Carbon Steel Grade 2,by Fullerkreg: Amazon.com: Industrial & Scientific
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Carriage Bolts, Neck Carriage Bolt, Round Head Square Neck - M8x60mm-3pcs - Bed Bath & Beyond - 35488701
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Hillman 3/8-in x 3-in Zinc-plated Coarse Thread Interior Carriage Bolt in the Carriage Bolts department at Lowes.com
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