DRILLCO DRL125SF148 - 3/4 Nitro Spiral Flute Hex Bridge Length Safety First Construction ReamerBrand Drillco Product SKU 125SF148 Category Reamers Size Fractional Material High Speed Steel Finish Coating Black & Gold Pack Quantity 1 Size 3 4 Overall Length 9. 3 8 Flute Length 7. 3 8 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)