DRILLCO DRL428A144 - 11/16 High Spiral Flute 1/2"" Shank Construction Reamer"Brand Drillco Product SKU 428A144 Category Reamers Size Fractional Material High Speed Steel Finish Coating Black Oxide Pack Quantity 1 Size 11 16 Overall Length 6. 3 8 Flute Length 4. 1 2 Description Construction or Car Reamers are especially adapted for heavy duty reaming as encountered in the fabrication of structural steel assemblies. They are tapered at the point to facilitate entering of holes which are out of alignment.