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most standard measurement methods are multiples of 4 and eight. Like most tools and drill bits, saw blades: 1/4, 1/16, 7/64, 3/32, 11/16, and such. Note the denominators in each of the sizes; there...

b/c the blades are sized by 1/8's so 6/8 or 3/4 8/8 1 inch, 5/8, 7/8, 4/8 or 1/2 inch, basically the majority of blades you will see increase in size by 1/8" the larger they get. Not sure why that...