Designed for use with nonmetallic sheathed cable in accordance with Article 370 of the 1990 National Electrical Code For Residential, Light Commercial, and Manufactured Housing, PVC Single gang with captive nails 4 knockouts, 2 each end 20.3 cubic inch box 3-1/4 inch deep x 2-1/4 inch wide x 3-7/8 inch length