Stop wasting time with set screws, locknuts, and clamps. Instead, use Arlington's SNAP2IT line of connectors for quick and easy installations. The tool-less design accepts many cable types, simply snap the cable into the fitting and snap it into the box. That is all there is to it. The fitting is zinc die-cast for strength and longevity, is cULus listed, and has an insulated throat to keep the conductor protected. Fits a 1/2" knockout, has a trade size of 3/8", and has a cable range of 0.405"-0.612". Red tinted internal clip indicates easier insertion of conduit. Sold by the bucket.
