PART NUMBER :  NSG17M1 DESCRIPTION : 17T Mod-1 Pinion Gear for 1/8 and 1/10 Scale Cars using Mod 1 Spur Gear. FEATURES: hardened steel construction Black in color YOU WILL RECEIVE: One 17T Mod-1 Pinion Gear One 4x4mm Set Screw REQUIREMENTS: Installation on the vehicle SPECIFICATIONS: length: 12mm (0.47&inch) Inner diameter: 5mm (0.20&inch) description revised by: WP February 12, 2014 MANUFACTURED BY: Hot Racing