ITEM NAME:30 x 3mm shank 1 mm ball point grinding diamond drill bits grinding pin I6B7 30 x 3mm shank 1 mm ball point grinding diamond drill bits grinding pin I6B7 Ball-shaped tip, galvanized diamond head. Can be installed on the electronic mill, hanging mill and hand drill (not included here). Used for sculpting, dressing, grinding and internal grinding of cemented car
