Diamond Cuticle drill bits , ball and needle shaped, 3/32 shank, | 3 pcs , Ball Head Diameter : 1.8 mm ,2.34 mm ; Needle Head Size :1.6*10 mm | The needle bit can be used to clean the cuticle area, side walls and also use it for under the nail edge. | The Ball bit can also be used for the cuticle area, and side walls. | Safe and Professional:Suitable for Manicurist or Beginner