Raco Manufacturing - Raco 689 Masonry Box, 1 Gang, Gangable, 3-1/2" Deep, 1/2" & 3/4" Knockouts

1-Gang Masonry Box, Gangable, 3-1/2 in. Deep, Ten TKO's Features: Rugged welded design does not fall apart during construction.; Gangable design allows installer to build unlimited number of gangs to hold multiple devices.; Rectangular shape fits square cuts in block.; Standard 1/2\" and 3/4\" TKO® knockouts.; Device ears inside the box prevent mortar from getting in the device holes.; Steel voltage partition #675 fits 2-1/2\" and #676 fits 3-1/2\" depth.; Forward mounted grounding provision allows for easy installation of grounding pigtail.; Standard wall plates can be used.; Supplied with ten 1/2 and 3/4 in. concentric knockouts; Gangable design allows construction of multiple gang box from one product; Ground is located near the front of the box for installer's convenience; 22.5 cu. in. capacity; For 6, 8, and 10 in. block walls - Prop 65: No