Klingspor DT 600 U Supra 125mm 322631 KRAFT TOOL CO. Their members established the organization Their members established the organization as a voluntary association committed to observing the strict quality and safety guidelines that go beyond the scope of the generally applicable standards Blue anodized aluminum prevents hands from turning black caused by oxidation The tools Klingspor makes available in the Supra performance class are also exceptionally reliable and guaranteed to produce top tier results in day to day use Klingspor's ongoing research and development efforts have had their share in the significantly improved quality of the company’s diamond tools