Hubbell Mason Box Single Gang 4 Concentric Knockouts 3-1-2 In. Deep

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