Contra 4 holes push bottom

• Apple Dental Airrotor Handpiece PUSH BUTTON Type
• Head Size : Standard Head, Fitting : Two Holes / Normal Fitting, Water Spray : Single, Wrench Type : Push Button, Bur Size : 1.59 mm - 1.60 mm, Air Pressure :0.18-0.21MPa, Speed : 350000-400000rpm
• Autoclavable upto 135 C
• Content : 1x Push Button Type Handpiece #SU, 1x Head Opener, 1x User Manual
• Anti-retraction function:three holes on the head to maintain airflow also when the dental unit is stopped,the dirt can come out under the air pressure of instance through these  holes.