Size SS 1220PCS M3 M4 M5 M6. And the average error is less than 0.01mm. Item model number M3 x 0.5, M4 x 0.7,M5 x 0.8, M6 x 1.0. Thread Size M3 x 0.5, M4 x 0.7,M5 x 0.8, M6 x 1.0. Style Hex Socket Head.
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