RMH3 Dental A1-TU Push Button High Speed Handpiece with 4 Hole Connection, Single water spray, exposed cartridge, and anti-retraction system. Specs: air pressure: 0.25--0.3 mpa; speed: 320,000-400,000rpm; torque: 0.4-0.45n; water pressure: 0.2-0.23mpa; atomization pressure: 0.3-0.35mpa; noise less than 65db.