Hubbell-Raco 2011-FBAR Non Metallic 2-3/4-Inch Deep Electrical Box, with 1 Gang, Bracket and Vapor Barrier Protection, 2-1/4-Inch x 3-1/2-Inch Self-griping non-metallic sheathed cable entry clamps are integral part of the box 18.0Cu. In. Capacity Self-contained metallic grounding strap Ccsa/us listed