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尺寸英寸mm66 1/27/81/21/25/87/81/41/2型号 (IADC)镶齿牙轮钻头钢齿牙轮钻头517, 537,617, 637517, 537517,527,547,617,627,637437,447,517,537,617,627,637437,517,537,547,617437,517, 537,547,617437,517, 537,547,617437,517, 537,547,617,627,637517,537,617,627,637537,547,617,637537,547,617,637
