Carlon B418AR-UPC 4" Square Box With Captive NailsCarlon B418AR-UPC 4" Square Box With Captive Nails Features:;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;Safe non-conductive, non-metallic, PVC;With captive nails;Safe, non-conductive, non-metallic;For new construction;10 internal clamps;18 cubic inch box;1-5/8" deep x 4" wide x 4" length