What I'm looking for isn't made by (or for) 80/20, but I thought people in this forum MIGHT recognize what I'm searching for. It's a clever corner key/corner bracket design with locking cams built into the arms. You can turn a hex-screw and the cams will automatically draw the two mitered frame members together, making the joint as tight as possible. Here's what it looks like:

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Does anyone know where I can get these little buggers, or who makes them?