These handy drill jigs have the proper spacing to fit MS21055 Corner Nut Plates.
To use, simply drill the hole for your bolt or screw (where the center nut will be). Insert the larger center lug of the tool into that hole and tap the tool with a hammer. The single small lug on one side acts as a transfer punch, locating the first rivet hole. Drill that hole, then insert the tool from the other side of the panel with the two lugs in the two holes. Drill through the bushing on the tool to locate the last rivet hole perfectly.
Sizes 06 through 10 have 0.344" rivet spacing; 1/4" size has 0.5" spacing. All sizes have a hardened tool steel bushing for a #40 drill bit.* Each size has its own handle style for quick identification. Sold individually.
* A #40 bit will drill the appropriate size hole for a 3/32" rivet. The 1/4" jig can also be used for 5/16" and 3/8" nut plates, but you must drill the center hole to 1/4" to use the tool. After all holes are drilled, ream the center hole to size and ream the rivet holes to 1/8" diameter.
Note: Fits standard-size MS21055 nut plates only. Does not fit any other nut plates.