This starter combo compatible with Vertex 16, 18 and 21 Engines and also SH 18 and 21 CXP engines.
NOT FIT for engines larger than .18 (.19 + etc),Not suitable for 1/16 engines (.07 or .05 for example).
Hex screw size: 12mm;Suitable for Engine 12mm hex Diameter shaft,6mm one way bearing.(The one way bearing NOT include)
Compatible with HSP HPI Axial Redcat Volcano S30 Hobao Himoto Kyosho 1/10 RC nitro truck car.
A great replacement part for the old or broken one.
Compatible Scale:1/10

Backplate Specification:
Material:Plastic&Metal
Replacement Part No.:11011
Backplate Screw Hole Distance:27mm;
Hex Screw Size: 12mm;

Drill Start Wand Specification:
Material:Metal
Replacement Part No.:11003
Shaft Rod Length:150mm
End diameter:5.8mm
Pins:M2x10

Package includes:
1 x RC Electric Starter Drill Plate
1 x RC Drill Start Wand

Item:12mm Hex Nut One Way Bearing
Replacement Part No.: R025
Package Include:
1x 12mm Hex Nut One way Bearing