Nitro® Construction Reamer, Series: 4275N, Imperial, 15/32 in dia, 5-7/8 in Overall Length, Reduced with 3-Flat Shank, 15/32 in Shank dia, Spiral Flute, 3-3/4 in Flute Length, HSS, Black/Gold. Drillco Nitro® 427N130 4275N Construction Reamer, Imperial, 15/32 in dia x 5-7/8 in L, 15/32 in dia Reduced with 3-Flat Shank, Spiral Flute