This is the Castle Creations 22T 32P Pinion Gear for use on Monster Trucks. FEATURES: Aluminum construction One year limited warranty through manufacturer beginning at date of purchase INCLUDES: One 22T 32P Pinion Gear One 4x4mm Set Screw REQUIRES: Installation SPECS: Length: 12mm (0.47") Inner Diameter: 5mm (0.20") cnh 9/23/09 ir/jxs