4 Square Box Extension Ring w/ 1/2″ & 3/4″ KO, 1-1/2″ Deep

Description

The CM-4SB-50/75-EXT 4 Square Box Extension Ring, part number CM-4SB-50/75-EXT, is a steel extension ring with a cubic capacity of 21 cubic inches. Measuring 4 inches in height and width, and 1-1/2 inches in depth, it features a drawn construction and includes (8) 1/2" and (4) 3/4" knockouts. This UL-standard extension ring weighs 0.50 pounds and is part of the CM4SB series, designed for use in 4" square boxes.