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The Riv-Nut Recess Dimple Die Set from HammerFab ensures the head your threaded insert or 'riv-nut' sits flush in your panel. These Riv-Nut dimple dies make a 3/4, 9/16, 1/2 or 7/16 recess and can be used with a 1/4-20 bolt or a hydraulic rivet tool and corresponding mandrel. Rated for a maximum thickness of 16 gauge mild steel and made from 4140 pre-hardened alloy steel, these dies are made to last for years of use.
Usage directions: Drill a 1/4 inch hole in your panel, install the dimple, then drill the 1/4 inch hole out to the proper size for the desired riv-nut. De-burr and install the riv-nut.