... cutter, Weldon shank, with more stable clamping for stable cutting and finish of holes.2. Additional one hole on the shank of ... 3. Applicable to hole cutting and process of annular groove on various magnetic drills and press, like Alfra, Hougen, ... traffic, bridging, shipbuilding, machine manufacture and so on.Equipment Enterprise culture Some certificate The newest HSS with weldon shank annular core