This is a keyboard plate for 60% keyboards.
This is a true HHKB (Happy Hacker Keyboard) style plate, including the 6u spacebar.
Thickness is 1.7mm, but the plate cut on the laser cutter shown is 2mm and works as well. 1.7mm is just what is specified for Cherry MX switches and 2mm is at the upper limit.
It does allow for Switch Top removal of both switch types for easy modding.
Plate supports Costar, Cherry Plate Mount and Cherry PCB mount stabilizers. I used costar in my build, but its nice to be able to switch to Cherry Plate Mount down the road.