Material  | Steel Pre-galvanized  | 
Size  | 1/2" K.O.  | 
Type  | Drawn  | 
Standard  | UL 514A  | 
Depth  | 1-1/2"  | 
Thickness  | 0.7mm - 1.6mm  | 
Usage  | 4" Octagon Boxes and Extension Rings are used in the installation of 
light fixtures and other electrical devices in walls and ceilings. The 
multiple knockouts (in sizes 1/2" and 3/4", MKO), non-metallic and metal
 sheathed cable clamps allow for easy installation.  | 
