5 Pack, Conduit Hanger With Carriage Bolt Nut, For 3812 Rigid 12 Electrical Metallic Tubing, Use To Secure Suspend Rigid Conduit, IMC Electrical Metallic Tubing Or PVC Conduit From Overhead Supports, Slotted Carriage Bolt Frees Both Hands For Installation, Each Part Is Stamped With Trade Size Markings