Light Fixture Knockout Fitting Garvin Mpc25 Multipurpose NM/BX Cable Connector (1/4" Knockout) - 10 Pack, Zinc Die-Cast, For Electrical Work Electrical Wiring Connector Pack Plastic Wire Clamp Corrosion Resistance: Strong resistance to corrosion making it suitable for both indoor and outdoor applications Barrel-Type Dual Connector, 3/4", PVC for NM-B Cables - NSI Industries Conductivity: Zinc is a good conductor of electricity, maintaining conductivity in electrical applications This is a 10-pack of MPC25 connectors that fit standard 1/4 inch knockouts - you know, those holes you punch out in electrical boxes and panels. They're made from zinc die-cast material, which means they're seriously sturdy and built to last through years of use These versatile connectors are used to connect non-metallic sheathed cable, flexible metal conduit, or armored cables to the tiny 1/4 Inch knockout provisions that are common on various industry light fixtures. Arlington N94-25 Black Button Push-In N Cable Connector, 3/8 Trade Additional Features: May include insulation or grounding capabilities to enhance safety in electrical applications