This is very well made, small anvil. The flat part on top is 3 1/8” at its widest by 9 5/8 long (total length is 14.5”. The whole thing is 4 5/8” tall. I weighed mine at 22 lbs. It has a square hole (5/8”x5/8”) and a round hole in the horn (1/2”) for bending. The square goes completely through and out the base, the1/2” hole does not go completely through the horn at 1/2” diameter on mine. The hole also does not go on through the base. I have used this more than I thought I would on small projects and hammering stuff back where it needs to be.