... of NSK 3.anti-retraction 1.dental handpiece,high speed handpiece,handpiece.2.exposed cartridge,compatible with ... -retraction function,avoid dirt into head and cross-infectionThe traits of standard head push-button type hign speed ... diameter10.30mmchucktypepush-button typeapply bur1.60mm standard burnoise≤65dBdescriptionstandard head,push-button typesingle spray system,,anti-retraction function,, ...