HSSE Dub Coated Twist Drill Bits tshwj xeeb tsim los ua haujlwm ntawm ntau yam ntaub ntawv xws li hlau, stainless hlau, cam khwb cia hlau, tooj dag, txhuas thiab lwm yam.Kev sib xyaw ua ke ntawm kev kub ceev steel (HSS) thiab cobalt muab cov khoom tshwj xeeb ntawm lub zog thiab hardness ...
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