The Mibro 3 1/2in. Double-Bolt Snap is a type of snap hook with a manually operated bolt action slide gate of medium security used to clip a light load to a ring eye loop or bight to temporarily secure or suspend an object. It is used for a wide variety of applications such as dog leads or clipping equipment to belts vests or other supports. The zinc coating increases durability in wet conditions. Not recommended for overhead lifting. Product Type: Bolt Snap.