Designed to induce coolant to newer style holders without rear pipe taps, the threaded lathe sleeves are targeted for use on machines that do not have the capability to run through-the-turret coolant. Across the general machining industry, customers are able to directly plumb in an external coolant line to the back of the sleeve using a standard ½ NPT or ½ BSPT pipe fitting. This gives users the option to adapt external high-pressure pumps directly to a turret station to maximize pressure and flow for long/deep holes.