壳形圆刃端铣刀 [GR] GR-5R50-FMB22 GR-8R63-FMB22 GR-8R66 GR-8R66-FMB22 GR-8R80 GR-8R80-FMB22 GR-8R100 GR-8R100-FMB22 刀片规格 RDMX1604MOTN RDMT1604MO RDMT1604MOF RDMW1604MOT-X8