Works on all siding types before or after the siding is up|Can be installed before or after siding is up|Mounting holes are provided on the inside of the box and along the flange|Both the box and siding block are UV rated, textured and paintable to match any siding or trim|Flanges may be removed for retrofit work|UV-rated plastic for long outdoor life|Deep design to accommodate GFCIs|To mount this box with siding already up, simply score and break-off flanges before mounting|6-1/2 x 6-1/2 in mounting surface