With a rotation speed of 300,000 rpm, these straight laboratory handpiece prove ideal for delicate, precise work. A completely unique dust protection shield helps give them an extraordinarily long service life. Technical Data: Speed of rotation 300,000 tr/min Air flow 35 litres/min. on average Bur changing mechanism Friction Grip (FG) Bur ø 1.60 mm as per ISO 1797 - type 3 Hose Grey straight silicone, with 2-hole coupling Weight (g) 60 Cleaning With Bien-Air Spraynet® Lubrication With Bien-Air Lubrimed® grease