Carmex Thread Mills Solid Carbide - With Through Coolant - Whitworth BSW BSF - 1/2 - 9/16, 3/4 - 13/16 x 12 - MT7Engineered for precision threading in metalwork, the Carmex MTB Thread Mills are a solid carbide solution designed to deliver clean Whitworth BSW BSF threads in through holes. With an MT7 shank and through bore coolant, this tool helps you achieve reliable cuts and longer tool life in demanding applications. Through Coolant Bore: Coolant is delivered directly through the bore to the cutting edges for efficient chip evacuation and effective temperature