Buffalo Dental 49300 no. 101 heavy duty laboratory hand piece, 0 - 45, 000 RPM. Buffalo Dental 49300 no. 101 heavy duty laboratory hand piece, 0 - 45, 000 RPM. Our most popular, high quality lab hand piece designed to operate hp-sized instruments to 45, 000 RPM without overheating.. permanently sealed ball bearings promote quiet operation and never need lubrication. Convenient push-type chuck is tightened from back via knurled handle. True-running hand piece minimizes end play and generates smooth performance..... permanently sealed ball bearings promote quiet operation and never need lubrication. Convenient push-type chuck is tightened from back via knurled handle. True-running hand piece minimizes end play and generates smooth performance....