Hubbell Raco Utility Box Extension Ring 1 Gang, 13 Cu-In, 4 In L X 2 In W X 1-7/8 In D

Used To Add Additional Wiring Capacity To Handy Box. Six 1/2" Knockouts (Sides) And Two 1/2" Knockouts (Ends). 4" X 2" X 1-7/8" Deep. 13.0 Cubic Inch Capacity. UL Listed.