Used items in great shape.

Length overall - 6”

Base - 2.75” x 1.5”

Opening for breaker handle - 2-3/16 x 3/4 x 1-1/4”

Appears to taper inside so I’d deduct an 1/8 at the deepest part of the recess

1/4-20 bugle head screw (used) will come with unit

Appear to be made from Bake-o-lite or some Glastic variant