Features and Benefits: •For use on plastics, ceramics, porcelain, plaster, acrylic, stainless steel, etc. Lab burs are NOT for Intraoral use! •Dust Shield shanks protect expensive handpiece spindles, bearings, and chucks by covering the chuck opening blocking out damaging dust and debris •Up to 90% reduction of contamination inside the front of the handpiece lowers handpiece maintenance costs and increases uptime •USA-manufactured instruments feature ultra-fast cutting and long-lasting edges to save you time and money