This is the Castle Creations 48P Pinion Gear with 5mm Bore Designed to offer a high strength 5mm bore option for 1 10 scale vehicles this 48P pinion has been constructed from carbon steel This incredibly strong material matched with the precision of being CNC machined and a high wear case hardened finish gives you a top tier pinion option Specifications . No of Teeths 28. Pitch 48. Bore Size 5 mm