All F-series enclosures include interior studs for mounting of ?Rear? and ?Right-Side? back panels and an interior door panel. Back panels are made of 0.080? brushed aluminum with four mounting holes. Right-side and door panels are blank, rear panels are either blank or with 39 pre-located holes for #8 self tapping screws, allowing simple attachment of most commonly used PV controllers, breakers, terminal strips, surge arrestors, and ballasts.