#57 DOT certified limestone is a medium sized stone, often used in construction projects for drainage, as a base material, or in concrete mixes. It is one of the most versatile and widely used types of crushed stone. #57 typically consists of crushed stones that are small enough to pass through 3/4 inch openings but are generally larger than 1/2 inch. The stones are commonly sized between 1/2 inch to 1 inches. It is commonly referred to by various names, including: 3/4" Crushed Stone; 3/4" Stone; 3/4" Crusher Stone; 3/4" Crushed Rock