The JMI Event Horizon EV-1RM is a 2" black-anodized aluminum focuser with gold anodized knobs with rubber grips and dual-speed operation. The focuser lifts up to 8 pounds. Dual-speed manual controls are over 15 times finer (small outer knob) and 1.5 times finer (large inner knob) than most rack-and-pinion focusers.
The EV-1RM mounts in many refractors having one of two different inside diameters of approximately 3.5" and 3.75". The focuser is motorized, so focusing is done with a touch of a button on the included hand control unit. Manual control with the knobs is still possible without removing the motor.
Partial list of Refractor Telescopes that should accept the focuser: