You can also find them in Wal Mart in the craft section. They usually come in a package of several different sizes ranging from 5 -10, etc.
They will have the larger diameter (smaller number) and then a smaller diameter (larger number) separated by a slash such as "5/10". The #10 usually does correspond to the 0.018" diameter as I have used these and tested the holes that they make and measured them and they are accurate enough. Just remember that the smaller the needle number, the larger is the diameter of the needle. > ive only been able to find sewing machine replacement > needles with numbers but these are larger than what > the mm size given in renners pinhole photography book > (p 118, figure 5.21a) > where can i get a #10 (0.46 mm/0.018 in) needle? > thanks! >
