Non-Optic Air Motor with internal water spray. Stainless steel composition with a Max Speed of 25,000 RPM. Works with e-type slow speed non-optic attachments with coolant water capability. Midwest 4 hole connection. Features: Max. speed 20,000 min-1, 4 hole , Anti-Retraction Valve, Handpiece Connection Type : ISO 3964 Type1, Type2 (Non-optic handpiece only), Internal Water Spray, Rotation direction in both forward and reverse drive, Benefits: Very quiet, short and lightweight, High torque and output power, Fully sterilizable