Check the listing for details. Router Variable Speed Controller Electric Motor AC Bench Grinder Fan Rheostat. Condition: New. Listed at 56.99 USD. Drill Hog Electronic Variable Speed Control Specifications: 120 Volts 15 Amps For "Brush Type" Motors Includes a Built in Fuse 6' Heavy Duty 3 Wire Double Insulated Cord On/Off Rocker Switch Switch for Variable Speed or Full Speed Variable Speed Knob Length: 4-3/8" Width: 2-9/16" Height 2-3/4" H Lifetime Warranty Drill Hog is proud to release the electronic variable speed controller. This unit is universal so it will work with many devices such as a router, drill press, angle grinder, bench grinder, electric drill, fan, electric motor, etc. Just plug in your device and you have variable speed! Beware of cheap knock offs. Drill Hog includes a lifetime warranty to the original purchaser. **Please Note: Angle grinder shown is for illustration purposes only and is not included.