This hardware allows you to create your own clamping jigs for dovetail grooves like those used with MicroJig's MatchFit clamps.
The dovetail keys can be customized to accept a variety of different sized bolts. You can also change the height, width, length and angle of the keys.
All this creates is the dovetail key that fits into dovetail grooves, you have to supply the bolt and other clamping hardware.
Update 20190704: It now works in customizer!