Trade Size 3/8, snaps into ½-inch knock-out to protect cables from rough metal KO edges * Offers the fastest method for installing single or multiple cables * Disconnect electrical power, insert connector into knockout, push cable in to desired length * Meets UL listing and CSA requirements for single or multiple cables * Arlington Industries Innovates to make work easy * 3/8 Trade Size, Fits 1/2-Inch Knock Outs * Better cable connectors for one or two cables that install easy, exceeds UL pullout tests * Connectors offer easy smooth cable insertion for single or multiple cables and a secure hold * Lowest cost NM cable connectors on the market and offer the fastest installation