Turbo Metal Gear Worm Motor (12V 160RPM 2.2kg.cm)
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INTRODUCTION
The turbo metal gear worm motor uses a metal gear box for durability and a high torque output. Due to the special mechanical structure of the worm drive the motor output shaft is self locking and can not be rotated.

(From wikipedia)
This part uses a two wire connection and supports direction control as well as PWM speed control. Rated voltage is 12v and will achieve 160RPM, with a torque of 2.2kg/cm.

Warning: Do not stall motor for extended periods of time to avoid damage to the gearbox.