A hard plastic firewall to fit 33 mm outside diameter F5J electric glider fuselage. This is usually also the spinner diameter. Motor/gearbox mounting holes have not been pre-drilled so it can be used wih any front mounting motor.
Note the 32 mm dimension on these firewalls is the fuselage front 
inside diameter i.e. the outside size less 2*fuse wall thickness
| Univeral Plastic Firewall Specifications | 
| Fuselage outside diameter | 
33 mm | 
| Fuselage inside diameter | 
32 mm | 
| Max gearbox/motor diameter | 
30 mm | 
| Central hole diameter | 
10 mm | 
| Weight | 
3.0 g |