High Speed Hand Tool NSKr 4 Holes 10 packs Go to amazon.com Related posts Thing need consider when find dental high speed handpiece? Feature 100% New and High quality. Connection Type:4 Holes135C Autoclavable; High-grade material with a stylish designApply bur: 1.6MM standard bur NOISE: 70dB DescriptionRotation speed:300000-350000rpm