Product Description Specifications Documentation Pinion for P7 gearboxes with a first stage of 5:1 and a motor with a 5mm shaft such as a RS-7nn sized motor (RS-755, RS-775).Pinion is an interference/press fit. For P7 Gearbox 1st Stage: 5:1 Bore: 5mm Max Bore: 0.200in (5mm) Length: 0.47in Installation: Interference (press) fit Number Teeth: 12 Gear Specs: 0.7Mod, 20PA Gear Material: Cold Rolled Steel Click arrow in center of image to load and interact with it Your browser does not support iframes.