Carmex Thread Mills Mini Type - Through Coolant - Metric - M2 x 0.4 - MT7Carmex Thread Mills Mini Type with Through Coolant is a compact, high precision solid carbide thread milling cutter designed for small diameter internal threads. Built for micro machining applications, it delivers clean M2 x 0. 4 threads with reliable coolant delivery and chip control. Through coolant bore: internal coolant delivery provides high pressure coolant through the tool into the pre hole, aiding cooling and chip evacuation during the