1:1, press-button chuck system, headsize Ø 10.1 mm, for contra-angle burs Ø 2.35 mm, with Midwest Connection. For couplers with a max dimension of 24.8 mm. Robust and durable, Ergonomic design, Simple bur changing with the push-button chucking system, Thermo washer disinfectable and sterilizable, External coolant supply (spray clip, coolant hose, nozzle cleaner) available as accessories Non-Latex