Union Butterfield Spiral Flute Tap, Fast High Performance, Series: 1677AP MXL Applix, Measurement System: Metric, UNC Thread Standard, M18x2.5 Thread, Semi-Bottoming Chamfer, 3 Flutes, HSS, TiCN Coated, Class of Fit: 6H/D6, Right Hand Cutting Direction, 21 mm Thread Length, 125 mm Overall Length, 0.542 in Shank Diameter, Right Hand Flute Direction, H6 Thread Limit, Alloy Steel, Aluminum, Aluminum Alloys, Brass, Carbon Steel, Copper, Copper Alloys, Nickel, Nickel Alloys, Stainless Steel, Steel, Structural Steel, Titanium and Titanium Alloys Material Application, No Through Coolant