Note the difference in finish between the sand cast product below and the investment cast part on its left. While sand cast steel parts are lower in cost, for slightly more you can have a smoother, lighter part that needs little to no machining. While investment casting tooling is much more expensive in the USA, this difference is very small in our Asian factory because the difference in labor. These particular pieces were made both ways. Machined castings are especially good candidates for saving through investment casting.