GREAT QUALITY: These insert nuts are made of co.ukom high quantity zinc plated carbon steel material which provides strength and offers good corrosion resistance in many environments. EASY TO USE: They are multipurpose threaded insert nuts that you can simple drive with them,easy to use. FEATURE: insert nuts are advantageous over barrel nuts and T-nuts, because they can be installed co.ukom one side of the workpiece. ASSORTED KIT: there are 6 different sizes insert nuts(please see the detail size in the description or the photos) so that you can handle on your project for co.ukee. NOTE: The pre-drilled hole must be as deep as the length of the insert nut plus any portion of the bolt that may be screwed past the end of the nut in the work piece Description: An insert nut provides a threaded socket for a wooden workpiece, similar to a wall anchor. These insert nuts are inserted into a pre-drilled hole by screw in, in that case the external protrusions bite into the wood, preventing the