Used to Secure an Ordinary Nut From Working Loose by Locking, Itself When Screwed Down Tight
Steel Box Connector for 1/2 in Knockout, 3/4 in Single Ac, Mc or Flexible Metal Conduit, No Locknut Required, Captive Clamp, Integral Red Plastic Insulated Throat Bushing,

• Special Features: Steel Box Connector for 1/2 in Knockout, 3/4 in Single Ac, Mc or Flexible Metal Conduit, No Locknut Required, Captive Clamp, Integral Red Plastic Insulated Throat Bushing, Used to Secure an Ordinary Nut From Working Loose by Locking, Itself When Screwed Down Tight