Just a simple corner piece to align a frame during glue up, and allow the use of ratchet straps to apply clamping force.

A notch was added to easily and reliably measure the diagonals to ensure right angles.

One version is for 90 degree angled pieces (normal faced off wood) and one when a 60 degree chamfer was applied before glueing, something you shouldn't do, but I had to :D

Can also be downloaded for Fusion 360, the chamfer angle is defined in parameters for easy adjustment: https://a360.co/2QPHufM

Note: The gaps shown in the photos are because my miter gauge was off, not due to this thing