Dimensions: LxWxH [11 1/16" x 10 1/8" x 1"] The length dimensions of the plate tapers down to 8 7/8" on the shorter end

The threaded hole uses a 7/16" - 14 coarse thread

The other 3 non-threaded holes have an ~7/8" countersunk hole on top and a ~9/16" through hole

The center to center between the holes is 4 1/4" from outside to middle hole and 8 1/2" for the outside holes.

The threaded hole is 2 3/4" from the middle through hole