This is an Adaptor Kit Used To Mount Tru-Turn Aluminum Spinners Onto The: Zenoah G38 Engines. This is a 8x1.25x40mm Hex Cap Screw (1-5/8" Lg) with 8mm Bushing Adapter Kit from Tru-Turn. FEATURES: The bushing, washer, and adapter nut is precision machined for a true running spinner. Steel washer and screw. Head of screw is tapped 10-32 for cone screw. Used to mount Tru-Turn aluminum spinners onto the following engines: Zenoah G38 Fuji Quadra FPE INCLUDES: One Adapter Bolt One Aluminum Bushing One Washer REQUIRES: 1/2" Wrench To Tighten Bolt Tru Turn Spinner SPECS: Approx. Weight: .64oz Screw Size: 8mm x 1.25mm x 40mm Bushing Size: 8mm COMMENTS: For the G45 & G62, use TRUQ3027. For the G23, use TRUQ4025. JAL 5/19/99 ir/jl