Carmex Thread Mills Solid Carbide - With Through Coolant - Metric - M4 x 0.7 - MT7The Carmex MTB solid carbide thread mill with through coolant is built for precision focused shops that manufacture metric threads, starting with M4 x 0. 7. Designed to deliver clean threads with reliable cooling, it ensures smooth operations from first cut to the final finish. Through Coolant Bore: coolant is delivered through the tool to the cutting edge, improving chip evacuation and helping maintain a stable cutting zone. Solid Carbide