DRILLCO DRL428N126 - 13/32 High Spiral Flute 13/32 Shank NITRO Construction ReamerBrand Drillco Product SKU 428N126 Category Reamers Size Fractional Material High Speed Steel Finish Coating Black & Gold Pack Quantity 1 Size 13 32 Overall Length 5. 3 8 Flute Length 3. 1 2 Description Manufactured from a premium grade of m 7N molybdenum high speed steel. The Nitro Heavy Duty Construction Reamers have a Ferritic Nitro Carburizing surface treatment which gives a hard protective layer to the reamer. This increases hardness (Rc 75 80)