Replace a worn or damaged Large Drive Bevel on your HPI Hellfire RTR - HPIC1050 and get it ready for fun again with the stock Bevel Gear 42 Tooth from HPI. This gear is part of the front or rear differential.FEATURES: Steel constructionINCLUDES: One 42 tooth large drive bevel gearREQUIRES: Installation following the model manualSPECS: Outside diameter: 1.5" (38mm) Inside diameter: .23" (6mm) Teeth: 42COMMENTS: For the diff case order HPIC5500HPIPart HPI86522