Product: Tungsten Carbide Internal Cooling Thread MillsMaterial: Tungsten Carbide Type: Metric,Website:http://www.chinabettool.com, Imperial, Non-standardProduct Description:Tungsten carbide internal cooling thread mills are with spiral cooling hole, the water or oil will through the cooling holes.The thread tools looks like taps, but taps can not process half hole, if you want to process a large product, thread mill is more suitable, if the thread mills crack, it is easy to get out of the product.And it can control the depth of the thread, it is usually used in CNC machine.Non-standard product is available.