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11.111.211.311.411.511.6mm11.711.811.9mm麻花钻高速钢
整体硬质合金头钨钢钻头.1.钻411.511.6117111.8ATA11.912mm
厂促整体合金钻头超硬钨钢涂层钻咀11.111.211.311.411.511.6新品