Sand Blast Nozzle 1,Durable and Lightweight. 2,Made of Metal Jacketed and Tungsten Carbide. 3,high quality,easy to install. Materials: metal jacketed and tungsten carbideDurable and lightweightSize Inch: 3/8, 7/16, 1/2, 3/6, 1/4 and 5/16 inchesMetric: 9.5, 11.2, 12.8, 4.8, 6.4 and 7.9mm