This is the Drive Gear 31Tx1M For the HPI Racing Super 5SC Flux 1/5 Monster Truck FEATURES: Made of steel INCLUDES: One drive gear Two 12x2.5mm hinge pins SPECS: Teeth: 31 (1-1/4") Diameter: 33mm (1-5/16") Height at hub: 8mm (5/16") Height at teeth: 5mm (3/16") Hole diameter: 6mm (1/4") Pin slot, length: 14pmm (9/16") width: 2.5mm (3/32") COMMENTS: This gear can be installed on the HPI Racing 1/5 Super 5SC Flux 2.4GHz RTR (HPID6258) 10/17/12 phijwa