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