Just measured mine:
3-3/4" tall (includes mount bar + vertical / tubular base for sliding into a shockmount)
5" long
13/16" deep
with 3/8" holes drilled (centered) at the 1/2", 1-1/4", 1-7/8", 2-1/2"*, 3-1/8", 3-3/4", and 4-1/2" marks on the long (5") dimension.
* center hole for the vertical support bar that drops into an A20/S shockmount.