5 Pack, Conduit Hanger With Carriage Bolt & Nut, For 3/8-1/2" Rigid & 1/2" 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.