Outlet Boxes,Cvrs & Bar Hgrs | Fast and Easy to Install - No More Set Back Boxes | Holding Prong to Hold Box, Locking Tab to Hold Bar in Position, Stud Spacing 16 in and 24 In, Load Capacity 50 Lb at 16 In, 21 Lb at 24 In, Weight 4 | One Device, Weight 26 Lb Per 100Southern Tier Electric Supply