Incision Driveshaft Set for 12.3" WB SCX10, SCX10-2 RTR, VS4-10, VRD, and H10 Platforms Universal Joint Style Hardened Steel Construction Splined Engagement 4mm Set Pins included to attach to pinion and transmission Splines are timed to allow for driveshafts to be installed in phase Compatible with Standard 3 gear transmission Scale Joint and Spline diameter size for realistic appearance Front Compressed length: 3.450" Front Extended length: 4.650" (Leaves 0.500" spline engagement, recommended not to exceed this length) Rear Compressed length: 3.80" Rear Extended length: 5.00" (Leaves 0.500" spline engagement, recommended not to exceed this length)