Conduit Hanger With Carriage Bolt & Nut, For 1" Rigid Or 1" 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, Ea ch Part Is Stamped With Trade Size Markings.