Nitro Engine Electric Starter Back Plate
Fits Vertex .16, .18, Sh .18, .21, and Infinity .18 Nitro Engines
Case size: 1 inch bolt pattern
Hex size: 12mm one way bearing
Compatible with: Aftershock 21, Aftershock 3.0, Aftershock 3.5, Backdraft 3.5, Caldera 3.0, Earthquake 3.0, Earthquake 3.5, Landslide 21, Lightning STR, Sandstorm 21, Shockwave, Tornado BB, Tornado S30, Volcano MX, Volcano S30, Volcano SV, Volcano T2, Vortex SS.