Product Description:
Carriage bolts is also called round head mushroom head square neck screws, mushroom head square neck screws, and round head square neck coach bolt, plow bolt, carriage bolt for timber.
Product Features:
Zinc Plated Carriage Bolts are largely used in security fixings, such as the Brenton Bolt where the bolt must only be removable from one side. The smooth domed head and square nut below prevent the carriage bolt from being unlocked from the insecure side.
http://www.xgf-hardwares.com/screws-and-bolts/
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