BT40-BYB19-120 搪孔范围：19-22.5
BT40-BYB22-135 搪孔范围：22-29.5
BT40-BYB29-150 搪孔范围：29-41
BT40-BYB29-180
BT40-BYB38-150 搪孔范围：:38-50
BT40-BYB38-210
BT40-BYB48-150 搪孔范围：48-65
BT40-BYB48-210
BT40-BYB62-150 搪孔范围：62-90
BT40-BYB62-210
BT50-BYB19-135
BT50-BYB22-150
BT50-BYB29-150
BT50-BYB29-180
BT50-BYB38-165
BT50-BYB38-225
BT50-BYB48-165
BT50-BYB48-210
BT50-BYB48-255
BT50-BYB62-180
BT50-BYB62-240
BT50-BYB62-330
