Jumbo anvil provides the user with a large 1-3/4" x 3-1/2" (45mm x 90mm) flat surface for pounding. We engineered this anvil to be well balanced, so with a heavy cast iron base which is 3-1/2" (90mm) in diameter, it will not tilt or bounce. Made of highly polished tool steel. The horn is 1-1/2" (40mm) long and tapers from 5/8" to 3/16" (16mm to 5.2mm).