... 3/8*3/8 10.6MM*10.6MM 19,20,21,22 1/2*1/2 12.7MM*12.7MM 16,17,18 ... ,19,20,21,22,23,24 5/8*5/8 16MM ... 16,17,18,19,20,21 1*1 25.4MM*25.4MM 14,15,16,17,18,19,20 1-1/2* 1-1/2 38MM*38MM 14 ... ,15,16,17,18,19 1*1/2 25.4MM*12.7MM ... 16,17,18,19,20,21 1*2 25.4MM*50.8MM ...