The Tamiya 72008 4-Speed Worm Gearbox kit includes one brushed DC motor and all the gears and parts to build any of the four possible gear ratio configurations: 84:1, 216:1, 555.4:1, 1428.2:1. The four gear ratio options give you the flexibility to choose the best speed and torque for your project.

Features
4mm dia. threaded driveshaft included
Included gearbox attachment parts can be easily installed at a choice of two attachment positions
Gearbox is compatible with other Education Construction items
Type 260 motor included - RPM: 5040 Max Efficiency, Voltage: 1.5V Recommended
Separately available 130 and 140 motors can also be attached with the included adapter
H.E. denotes High Efficiency
Pictorial instructions included

Ratios: 84:1, 216:1, 555.4:1, 1428.2:1
Free-run motor shaft speed @ 3V: 9400 rpm
Free-run current @ 3V: 150 mA
Stall current @ 3V: 2700 mA
Motor shaft stall torque @ 3V: 0.97 oz-in
Length: 1.92" (49mm)
Width: 1.24" (31.5mm)
Height: 1.85" (47mm)