Amazon.com: National Hardware N280-859 V7652 Flat Head Carriage Bolts and Nuts in Zinc plated, 12 pack,1/4" - 20 x 1-3/4" : Industrial & Scientific
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M6/M8/M10/M12 Hex Head Bolts Left Hand Thread Screws 304 A2-70 Stainless Steel | eBay