Product Description Specifications Documentation Pinion for P6 gearboxes with a first stage of 4:1 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 P6 Gearbox 1st Stage: 4:1 Bore: 5mm Max Bore: 0.236 in (6.0mm) Length: 0.35in Installation: Interference (press) fit Number Teeth: 15 Gear Specs: 0.6Mod, 20PA Gear Material: Cold Rolled Steel Click arrow in center of image to load and interact with it Your browser does not support iframes.