A water jet cutter, also known as a water jet or waterjet, is an industrial tool capable of cutting a wide variety of materials using a very high-pressure jet of water, or a mixture of water and an abrasive substance. The term abrasive jet refers specifically to the use of a mixture of water and abrasive to cut hard materials such as metal or granite, while the terms pure waterjet and water-only cutting refer to waterjet cutting without the use of added abrasives, often used for softer materials such as wood or rubber. Waterjet cutting is often used during fabrication of machine parts. It is the preferred method when the materials being cut are sensitive to the high temperatures generated by other methods. Waterjet cutting is used in various industries, including mining and aerospace, for cutting, shaping, and reaming. Waterjet machines can cut practically any material, ranging from the very soft such as foams, gels, sponges, through to harder materials such as plastics, composites, rubber, leather, soft metals such as aluminum, brass, copper, carbon steel and stainless steel, and ending with heat-resistant and hardened steels, ceramics and cemented carbides. Waterjet can also cut glass, stone, granite, marble and ceramic tiles which are among the hardest most brittle materials encountered in industry. The thicknesses of the cut materials reach up to 200 mm, which is inaccessible for the majority of other cutting technologies. One of the principle advantages of Waterjet machines is that the width of the cutting gap is very small, less than 1 mm, which allows cutting out of extremely intricate shapes and precision cutting of corners.