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HEC52 Tungsten Steel Drill Bit 3D High Efficiency Solid Carbide Drill Bit Twist Drill (NHA170), Find Details and Price about Cutting Tool Carbide Drill from HEC52 Tungsten Steel Drill Bit 3D High Efficiency Solid Carbide Drill Bit Twist Drill (NHA170) - RUNCHIT PRECISION TOOL (SHANGHAI) CO., LTD.