Hubbell 53151KBAR Extension Ring, 1/2 in, Metal, Ceiling, Wall

Hubbell Extension Ring, Knockout Size: 1/2 in, Square, Cubic Capacity: 21 cu-in, Dimensions: 4 in L x 4 in W x 2-1/2 in D, Metal, Ceiling, Wall Mounting, Includes: (2) Raised Ground Screw, Extension Ring Features: - Square boxes are used where multiple conductor runs are split into two or more directions to bring power to a number of electrical devices - Self-tapping screws virtually eliminate stripping