6,10,12,16,20,22,25,28,32,35,38,41,44,48,51,54mm or         

1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4",1-3/8", 

1-1/2", 1-5/8", 1-3/4", 1-7/8", 2", 2-1/8"