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About #57 Gravel Stone (P2). #57 Stone is an aggregate that is processed from natural durable materials. The size of #57 Stone spands from very small to 1 inch. #57 Stone is commonly used in mix concrete, mix asphalt and as bases for retaining walls and driveways.#57 Stone can also be applied in irrigation and on gravel roads.57 Stone is an aggregate that is processed from natural durable materials. The size of #57 Stone spands from very small to 1 inch. #57 Stone is commonly used in mix concrete, mix asphalt and as bases for retaining walls and driveways.
Sizes of Crushed Stone. There are many sizes of crushed stone available, usually from 1/4 inch up to 2 1/2 inch. In between, you get 3/8 inch, 5/8 inch, 3/4 inch; these sizes are all suitable for driveway construction. You may also see a minus size listed, for example, 1/4 inch minus.he Layers of a Crushed Stone Driveway. Before looking at the types and sizes of crushed stone, it is important to be able to visualize what a driveway made of this material consists of: 1  A driveway bed of 6 to 12 inches deep, the base of which has been compacted.