Cartridge Type HeadsBoring range 80 - 220mm - Roughing. 90 Approach Heads.Simultaneous movement of both slide-blocks on rough boring heads. Inner pre-load device between body and slide block on finish boring heads. Override device on adjusting screw in rough boring heads. Few boring head components. Simple adjusting and locking mechanism. Setting diameter with boring head mounted in machine tool using micrometer or caliper. After setting to the required diameter it prevents slide block from moving while tightening lock screw. Prevents adjusting screw from stripping threads; very easy and fast to adjust. Precision machined components. Made from chrome nickel alloy tool steel. Modular components - simple yet secure coupling system. Large adjusting ranges on rough and finish boring heads. Rough and finish boring heads for many insert styles. High accuracy and repeatability. Very rugged - excellent durability. Components remain securely locked even under severe machining conditions.75 and