... -change system.3. Applicable to hole cutting and process of annular groove on various magnetic drills and press, like Alfra, Hougen ... .4. Made of high-performance high speed steel., e.g. M2, M2AL, M35, M42 etc. And can be used on various ... project, railway traffic, bridging, shipbuilding, machine manufacture, aviation and spaceflight. HSS annular cutter