Probably the best E-type air driven motor on the market, the 181K is smooth from 0 to 20,000 rpm. Compatible with Kavo and other E-type speed increasing and reducing contra angles. Standard 4-hole connection. No fiber optics, water, or chip air available on this one. Forward/reverse speed and directional adjustment. Sterilizable. Kavo 181K operates well at an air pressure range of 36-43 PSI.