5 Pack, Conduit Hanger With Carriage Bolt & Nut, For 3/4" Rigid & 3/4" 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.