1. Straight groove taps: Thread size: M16 x 2; Thread length: 33 mm / 1.3 inches; Square size: 13 mm / 0.51 inches; Cutting direction: Left thread (reverse). Straight groove design with downward chip removal, clear threads, fast and precise tapping. 2. Wide application: Suitable for processing through holes. Used for drilling and tapping stainless steel, aluminum, tool steel, bronze, hard plastics, etc. Recommended feed speed: General steel: 615 m/min; Harder steel: 510 m/min; Stainless steel: 27 m/min; Cast iron: 810 m/min. 3. Coating: The coating provides corrosion protection, significantly improves wear resistance and hardness, and reduces the coefficient of friction. Made of M35 cobalt speed steel with hardness (HRC6566), red hardness, wear resistance, and good toughness. 4. Easy to use: The thread tap is compatible with drills, tapping machines, CNC, and milling machines. Use tapping oil to achieve quality threads and extend tool life.