Masonry boxes are designed to accommodate the mounting of switches or other devices in masonry walls. 2-1/2 in. deep boxes are used in 4 in. block walls, 3-1/2 in. deep boxes are used in 6 or 8 in. block walls. Nongangable design available from one to six gang configurations in either 2-1/2 or 3-1/2 in. depths. Rugged welded construction. Standard 1/2 and 3/4 in. concentric knockouts. Device ears formed inside the box, preventing mortar from getting in the device holes. Standard wall plates cover box opening.