This is an Adapter Kit Used To Mount Tru-Turn Aluminum Spinners Onto The: Zenoah G23 YS 45-61 (2-Stroke) OPS Maxi 30 Rossi 40-61 Peco 60-80 Webra 61-120 (All) FEATURES: Steel Adapter Nut Screws Onto The Crankshaft Holding The Propeller On, Then A 10-32 Bolt Screws Into The Nut From Front, Holding The Spinner In Place. INCLUDES: One Adapter Nut One Propeller Washer One Aluminum Bushing REQUIRES: 1/2" Wrench To Tighten Bolt Tru Turn Spinner SPECS: Adapter Nut Thread Size: 8 x 1.25 Spinner Mounting Bolt Thread Size: 10-32 Bushing Size: Inner: 8mm Outer: 3/8" COMMENTS: For the G45 & G62, use TRUQ3027. For the G38, use TRUQ4035. JAL 5/19/99 ir/jl