This engine mount is specifically designed to fit the new .46 sized engines. Specification: Fits numerous .46 size engines including ASP .46, Enya .46, O.S. .46, Royal .46, Webra .40, YS .46 and others.. FEATURES: glass filled nylon construction No hole to mount a nose gear INCLUDES: 1 mount (round base) 4 Sheet metal screws #4 size 5/8" long REQUIRES: drilling 4 3/32" holes in the beams for engine machine screws and nuts to attach engine to mount SPECS: width between arms- 1.37" length of arms (only)- 1.85" width of arm- 0.35" diameter of base- 2.17" NMH 3-28-99