Found these is a box of junk. Half the tree, numbers 4,5,6,10,11,12 - note they are longer than today's nozzles, and they have tiny side holes around the central hole. No square holes, not even for the #1 nozzles, which also came with tiny side holes. Of course, the "dirty-water" strainer in today's heads would not work with these nozzles. The original strainer was much a finer mesh.