... 2’’25.4mm*12.7mm16,17,18,19,20,211-1/2’’*1-1/2’’38mm*38mm14,15,16,17,18,191’’*2’’25 ... .4mm*50.8mm14,15,162’’*2’’50. ... DiameterIn inchIn metric unit(mm) 1/2’’*1/2’’12.7mm*12.7mm16,17,18,19,20 ... ,213/4’’*3/4’’19mm*19mm16,17,18,19,20,211’’*1’’25 ... .4mm*25.4mm15,16,17,18,19,20Technical Note:1 ...