Coolant shoots directly over the cutting edge of the insert. Double coolant inlet simplifies the coolant connection to the machine. Lock and release the insert quickly and powerfully with the new patented Dor Lock clamping system. Patented thru coolant and locking clamp in 1 system. The advanced design of the Jet-Stream boring bar offers the ability to use the front coolant port to flush chips out of the way so that they do not get packed or re cut, by simply installing the supplied coolant nozzle screw. This will help prevent damage to the insert, the tool itself and even the part that is being cut. If this is not necessary in an application just replace the coolant screw with the already supplied solid screw and this will disable the front coolant port and use only the coolant port at the tip of the insert. The body's of the Jet-Stream boring are built with chromium molybdenum alloy steel. This material features properties of high tensile strength and high yield stress. This material is heat treated to 40-44Rc and Electoless nickel coated, it will prevent the tools against rust providing a long tool life under severe working conditions. 1/8 NPT. Style U - negative 3 degrees end cutting lead angle for negative 55 degrees diamond DNMU 432 inserts.