Enable the possibility of assembly with high and low gear ratios Four gear ratios (84:1, 216:1, 555.4:1, 1428.2:1) 4mm diameter Type 260 motor included This is the Tamiya 4-Speed Worm Gearbox H.E. The Type 260 motor has been used in a variety of applications since its release in 1985. The gear boxes are often used in Robotics contests and enable the possibility of assembly with high and low gear ratios. Features:• The gearbox features four gear ratios (84:1, 216:1, 555.4:1, 1428.2:1)• Gear ratio can be easily adjusted by altering the middle and final gear attachment positions• 4mm dia, threaded driveshaft included• Included gearbox attachment parts can be easily installed at a choice of two attachment positions• This 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