50-Pack. 3/8" trade size, 1/2" knockout, MC cable connector snaps quickly onto the conduit with an internal spring steel clip and then snaps into knockout with external spring steel clip. Just snap the fitting onto the cable, then into the electrical box. No tools needed for a secure assembly. Makes it easy to secure metal-clad cable into boxes or enclosures. Perfect for new or old work and can be removed and reused. Made from durable zinc die-cast with a silver finish, built to endure tough job site conditions. Concrete tight when taped. Comes with insulated throat (rated up to 105℃ to help prevent damage to wires). Supports cable outer diameters from 0.405" to 0.610", including 14/2, 12/2 (with/without ground), 14/3, 14/4, 12/3, 12/4, 10/2, and 10/3. UL Listed - Certified for safety, performance, and code compliance.