Carriage Bolts with nuts
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Also known as Mushroom head square neck bolts or Round head square neck bolts. These bolts have a square neck that keeps them from turning after installation. Put them into a round or square hole and tighten with a nut. Used to fasten wood-to-wood and metal-to-wood - Heads are large smooth and domed with no drive - DIN 603 - ISO 8677 - 4.8 steel grade - zinc plated - supplied with nuts.