This is the optional 13 Tooth Pinion Gear for the Team Associated RC18T RTR racing truck (ASCC2011). FEATURES: Steel construction, black in color INCLUDES: One 48 pitch pinion gear One 3x3mm set screw (ASCC9705) REQUIRES: Installation onto the motor shaft SPECS: Length: .39" (10mm) Mounting hole diameter: 2mm COMMENTS: Also available is a 11 tooth pinion ASCC0157 12 tooth pinion ASCC0153 13 tooth pinion ASCC0154 14 tooth pinion ASCC0155 15 tooth pinion ASCC0156 kpm12/07/2004 ir/jxs