Riprap is made from oversized boulders. It is broken to size, usually with a hydraulic breaker and then screened on specialized equipment to achieve the specified gradation. Stone products which are approximately 5 inches and larger are sometimes thought of as riprap, however 12 inches and larger are much more common. Riprap is used on various bodies of water including oceans, bays, rivers, lake shores and bayous, to armor the shorelines against scour and erosion. The smaller riprap is used mainly in inshore environments as well as in rivers, lakes and streams for shoreline revetment, bridge abutments, outflows and similar applications. The larger riprap is mainly used in the marine environment for use in building jetties, breakwaters and similar structures. To obtain this data for riprap, a test known as a weighted gradation is performed instead. This entails weighing the stones individually. Gulf Coast Limestone custom produces riprap of any size, to meet the requirements of all types of projects and to meet the gradation specifications as written by the design engineer.