This gear can be used in the used in the Toughbox series gearboxes, replacing the 50 Tooth Large Output Gear. It would be paired with a 21 Tooth Small Cluster Gear, in order to increase the output speed of the Toughbox. Standard Toughbox output reduction: 12.75:1 New Toughbox output reduction, using this gear and a 21 Tooth Small Cluster Gear: 7.31:1 Specifications: