From the original Buchanan SSB7 Series Barrier Strips, these Single Screw Barrier Terminal Blocks have a .4375" Pitch and are rated 20A/600V (Clamp Screw) or 15A/600V (Binding Head Screw) with 12 AWG wire (Clamp Screw) or 14 AWG wire (Binding Head Screw).
Download the spec sheet to find the right part number for your application.