Quality Inspection
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How to tell if a countersink is real cobalt HSS?
Methods: 1. Color - cobalt HSS grinds bright white, standard HSS is greyish; 2. Sound - cobalt HSS rings clearly when tapped; 3. Grinding wheel - cobalt steel throws fewer, finer sparks; 4. Price - too cheap means not real cobalt HSS; 5. Most reliable - spectrometer analysis; 5%+ cobalt content qualifies as cobalt HSS. Lihao Technology uses imported M42 steel with 8% cobalt, provides material certificates, ten-times refund for counterfeits.
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