Not sure how much sand and gravel you need in a concrete mix? Not a problem, Post Hole Mix is a pre-mix product with the correct amount of sand to gravel (or metal) ratio. With this mix all you need to do is add the cement (which we also stock Blue Circle Cement) and water and it’s ready to be poured. The sand used in this mix is Coarse Washed Riversand and the Gravel is Blue Metal 10mm if you want to buy them separately.