Black steel 48 Pitch 14 Tooth Pinion Gear. FEATURES: Standard 4140 steel and heat treatedheavy duty 3mm set screw for brushless powerYOU WILL RECEIVE: One 48 Pitch 14 Tooth Pinion Gear with 3mm set screwSPECIFICATIONS: Inner diameter: 1/8" (3mm)Length 9mmdescription revised by: WP April 1, 2014