any size and any spray pattern. My buddy runs them in a 6x18 and i run regular 7mm nozzles with the same 6x18 size andspray pattern. His are actually better because there is more meat in the nozzles which means less effected by ppump pressures and heat so the tip wont blow out. Plus you have more room to play with spray patterns. At the same time, i have not heard of two many problem with six hole 7mm nozzles either