64ths of an inch are not shown on most rulers or tape measures so all you can do is estimate that the next number higher or lower would be 4/64 or 6/64 and reducing both would be 4/64 is 1/16 and 6/64 would be 3/32 which neither is shown so so take 2/26 is 1/8 which 8ths are shown so figure that 5/64 ths is about 1/8 vicinity