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17 is the quantity of 1/4" x 4" carriage bolts you will need for this project. It looks like all of his first numbers are the quantity needed for the project.1/4" is the diameter (NOT the head diameter) of the bolt and the 4" is the length.Thanks to Bolt Depot for the diagram! https://www.boltdepot.com/Product-Details.aspx?product=2750
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