Innovative Screw Thread Structure,Super good Light Guiding.
Resisting X-Ray,High Strenght
Black: Diameter-1mm , Length – 17mm,Yellow: Diameter-1.2mm , Length – 17mm
Red: Diameter-1.4mm , Length – 17mm,Blue: Diameter-1.6mm , Length – 18mm
Drill Rotation Speed: 1000-2000rpm