Extension ring, length 4in., width 201.7in., depth 1-1/2in., capacity (cubic in) 21.0, knockout (in) 3/4 & 1/2
Item#: PI391
Extension Rings, 4 in. length, 4 in. width, 1-1/2 in. depth, 21.0 cubic in. capacity, 3/4 and 1/2 cubic in. knockout are used when extra cubic inch capacity is needed for additional wiring. Galvanized steel.