The Mod-U-Blast Jr. tool consists of multiple carbide and steel components. Designed to connect to a 3/8” NPT pipe lance (customer furnished) with the tool at one end and the tungsten carbide reducer (supplied with # EE01098 model) at the other, the reducer threads into standard 1-1/4” NPSM nozzle holder. Aluminum oxide, silicon carbide or heavy steel shot not recommended.