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High Precision 90 Step Twist Drill For Standard Thread Micro Grain Carbide End Mill Durable Micro Grain Carbide End Mill, 90Step twist drill for Standard thread , for cutting soft materials,alloy steel,etc. coating with TiN TiCN TiAlN Description: All bits are made of micro-grain tungsten carbide. Produced by High precision CNC grinding machines such as Walter (Made in Germany) and Anca ( Made in Australia). According to different cutting request, we have different coating