Bullet Fastener

These anchors are also called as drop-in anchors, specially designed for anchoring into concrete or wall. These anchors are dropped into a pre-drilled hole and then expanded using a thin rod with hammer. A Hex bolt is then added to the thread.

A zinc plating provides corrosion resistance in wet environments. Also known as drop-in anchors, these are often used for overhead applications because the anchor's internal plug expands in four directions to hold the anchor firmly inside the hole before inserting a threaded rod or bolt. To install, place the anchor into the hole, insert the required installation tool into the anchor, and drive with a hammer until the thicker portion of the tool makes contact with the anchor. 

Anchors can be installed below the base of the surface as well as flush with the surface.