Harlingen MWLNR123B Indexible turning tool holder. 5-degree lead angle for turning, profiling or facing. Superior edge toughness. Excellent wear and depth-of-cut notch resistance. For use in all finishing, medium, and roughing applications. Each tool holder is black oxidized. The ultra smooth surface is rust proof and extremely durable. HRC 65, hardened high grade alloy steel provides outstanding strength and rigidity delivering higher productivty, stability, and longer tool life. Using a .02 mm feeler gage, each tool is qualified to assure the gap between the insert and pocket base is