This is the RC18 18T Pinion Gear from Team Associated Team Associated RC18T RTR racing truck (ASCC2011). FEATURES: Steel construction, silver in color INCLUDES: One 18T pinion gear One 3x3mm set screw (ASCC9705) REQUIRES: Installation onto the motor shaft SPECS: Length: .39" (10mm) Mounting hole diameter: 2mm COMMENTS: Also available in 16T pinion ASCC1158 17T pinion ASCC1159 18T pinion ASCC1160 tlw 8/8/07 ir/jxs