Use the Bridgeport 9882 2-1/4-Inch Polypropylene Universal Stud Bushing with Washer to Protect Wire Insulation in Metal Studs. The 9/16 inches diameter bushing is used for all pre-punched shaped holes and allows smooth wire pulling. Molded of high strength, non-conductive polypropylene and the bushing is corrosion, freeze and chemical leak-resistant providing a long-lasting fit. Solidly built to meet construction and general industry OSHA-recognized NRTL-listed electrical standards and meets the stringent bonding and grounding requirements of 514B cULus. Bridgeport builds every product with the same goal in mind: guaranteeing a fast, professional-grade, trouble-free installation. Our wide selection of products is manufactured for innovation, consistency and quality — providing you with connectors, couplings or transition fittings that are safety listed, ensuring code compliance to meet your needs, enabling you to do your best work at a lower total cost. When you need a solution you can depend on, be sure to look for Bridgeport Orange.