1.16 mm Cutter Diameter x 3.50 mm Reach Carbide Single Form M1.6 Thread Milling Cutter, 2 Flutes, AlTiN Coated. This metric offering of Thread Milling Cutters - Single Form features tools intended to cut internal and external, right hand and left hand metric threads, and can mill multiple pitches. Browse from a selection of uncoated and AlTiN coated styles.