Carmex Thread Mills Solid Carbide - With Through Coolant - NPT - 1/2 - 3/4 x 14 - MT7The Carmex MTB Solid Carbide Through Coolant Thread Mill is engineered for reliable, high precision NPT threading in CNC environments. Its designed for shops that demand consistent thread quality from 1 2" to 3 4" diameter with 14 TPI, using a MT7 shank for stable, vibration minimized cutting. Through Coolant Bore: Coolant is delivered through the bore to the cutting edges, enhancing chip evacuation and reducing heat buildup in deep or narrow holes.