Sandvik Coromant 8550486 Tap & Drill Sets; Minimum Tap Thread Size (Inch): 1/4-28 ; Maximum Tap Thread Size (Inch): 1/4-28 ; Maximum Drill Size (Fractional Inch): 1/4 ; Tap Type: Spiral Flute ; Tap Coating/Finish: AlCrN ; Tap Material: High Speed Ste