Jack Nuts are threaded inserts that come in varying grip ranges that are designed for use with thin metal, fiberglass, and even soft plastics.

Well Nuts are flanged neoprene rubber bushings with a machine nut molded into one end.

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Part Number 29905
InstallationTool
http://www.tifco.com/products/29905

Part Number 85645
172Piece Assortment with both Jack and Well Nuts along with the Jack Nut Installation Tool

Part Number 85646
151Piece Assortment with Well Nuts and StainlessSteel Machine Screws and Cap Screws

Part Number 85639
316Piece Assortment with Well Nuts and StainlessSteel Machine Screws and Cap Screws