DRILLCO DRL125SF236 - 1-9/16 Nitro Spiral Flute Hex Bridge Length Safety First Construction ReamerBrand Drillco Product SKU 125SF236 Category Reamers Size Fractional Material High Speed Steel Finish Coating Black & Gold Pack Quantity 1 Size 1. 9 16 Overall Length 10 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)