10.812.1mm (Standard head). Dorit DR 165 fiber optic high speed turbine with the kavo multiflex couplingsCity State Zhengzhou, Henan China. The seller is march-dent and is located in this country CN. being dental turbine high speed handpiece kavo multiflex nsk phatelus coupling midwest 4 hole connection with drive air supply and exhaust, atomised water coolant and chip air.