Product Description:Product Name: RC Electric Starter Back Cover✔RC power starter back cover for 1/8 or 1/10 scale engine cars, 1/5 motorcycles, 15cxp engine air helicopters, 18cxp engine aircraft.✔The RC electric starter back cover is suitable for HSP class 16.18.21 and SH18/21 engines.✔ Replacement is simple and convenient.✔ The back cover of the electric hand-held power starter does not contain a hexagonal one-way bearingSpecifications:✔ Material: plastic and aluminum alloy✔ Color: Black✔ Product ID: 11011✔ Back cover center hole spacing: 27mm (center to center)✔ Suitable for 1:8 or 1:10 engine vehicles✔ Compatible with: Vertex 16/18/21/25cxp SH 18/21 GO /OS/ FC 15-21CXP Japan-18cxp NitroNotice:✔ This product does not contain hexagonal one-way bearingsPackage Contents:✔1 x RC back cover