feature: simply and  convenient design,high precision
                   catalog number: BT30-ER11/ 16 / 20/ 25/ 32/ 40
                                                   BT40-ER11/ 16/ 20/ 25/ 32/ 40/ 50
                                                   BT50-ER16/ 20/ 25/ 32/ 40/ 50
                     
                       brand :       NEXTCUT