This HiTec servo is a multi-turn servo winch. Depending on the RC system used, you can get up to 4 full 360 degree revolutions of high torque out of this servo.
For a general servo overview manual follow this link.
These are HiTec HS-645MG Ultra Torque Metal Gear Servos for your Heavy Duty needs!
These are HiTec HS-422 Servos for use in any application.
The Micro Maestro is the smallest of Pololu’s second-generation USB servo controllers. The Maestros are available in four sizes and can be purchased fully assembled or as partial kits.
This is the chain and sprocket kit for the IG52-DB4 robot platform. It includes the sprockets, 6 feet of #25 chain, and 4 connecting links.