Featuring a graduated dial 0.001". Phosphor-bronze nut. Body diameter 1 3/4", Body length 2 1/8", Boring capacity 4 1/2", Tool holder swings through 90deg. Accepts 3/8" tooling. Available in 2MT and 3MT (tapped 3/8" Whitworth) and R8 (tapped 7/16" unf).