This is a Dave Brown Glass filled nylon engine mount for .05-.06 engines. FEATURES: Glass filled nylon construction. INCLUDES: One nylon mount. Four sheet metal screws to attach engine to mount. REQUIRES: Mounting screws and blind nuts to attach to firewall. SPECS: Length of arms: 25.4mm (1.0") Inside distance between arms: 18mm (.719") Outside distance between arms: 30.2mm (1.188") Overall length: 30.2mm (1.118") Thickness of arms: 11.6mm (0.459") jmm 7/20/02 ir/kh