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1. CAT NO tapershank is in conformity with AT3 standard
2. Fittingtolerance H6 for straight sets
Material:Allyed case hardened steel,black-finished and precisely grinded
Hardness: HRC 56-58
Carbon depth: 0.8mm±0.2mm
Surface Roughness: Ra<0.005mm
Shank body standard: ANSI B5.50
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