Aggregate Size Standards

How does our sizing compare to NTMA standards? We try to get our sizes as close to NTMA Size Standards as possible. We import and produce most of our materials (except local recycled materials) from overseas and they use the metric system so the sizes may off by a tiny amount. We would like you to contact us before ordering for large projects and we'll send you a sample kit of the sizes so you can see exactly what a #0, #1 etc. look like.

Here is a size chart for how we convert our sizes. You can order in mm from us or we can do the conversion for you.