This high-quality Abrasive Air Gun Kit is ideal for etching designs, initials and figures on glass, stone, metal or plastics. The pistol-grip metal gun comes with a polyethylene abrasive medium reservoir bottle, and has an adjustable tip for use with a variety of abrasives, including aluminum oxide, pumice, starch, or any fine abrasive that will pass through a 30 to 100 mesh screen. The gun has a 1/4" NPT to connect to any compressor, which can supply between 20 and 80 psi (1.4 to 5.5 bars).