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

Description

The CM-4SB-50-EXT 4 Square Box Extension is a 1 1/2" deep extension ring designed for electrical applications. Made from durable 16G steel, it has a cubic capacity of 21 cubic inches and measures 4 inches in height, width, and length. This UL-standard extension ring features 12 knockouts of 1/2" each and weighs 0.72 pounds. Ideal for expanding existing 4" square boxes, it belongs to the CM4SB series and is categorized under 4" square boxes.