The GPM 20CR Steel Motor Gear MG5015TS is engineered from 20Cr steel and finished with a black hardening process to enhance wear resistance relative to standard gears. It is specified with 15 teeth, a module of 1.0mm and a motor tooth diameter of 5mm, dimensions commonly used in 1/8-scale ARRMA and TRAXXAS applications. The motor bore is circular and retained by two 4x4 set screws to provide a secure mechanical joint. Verify the gear geometry and motor shaft dimensions prior to installation to ensure compatibility with your drivetrain setup.