Same Great Micro Shanks, but in bulk packaging! OPST's Micro Shanks are practically identical to our steelhead shanks, only in a thinner diameter of 0.90mm (0.035"). The length is 32mm or 1-1/4". These shanks are intended for trout and warmwater flies, where a finer shank is desirable. Their light weight also makes them ideal for dry flies and skaters. 25 per pack.