Electrical Bushings Plastic Insulating Bushings 6" - Flame retardant Threaded Plastic Inserts for conduit.Thermoplastic Conduit Bushings 6" features include: Use to Protect Conductors in Rigid or IMC Conduit from Abrasion/Damage during Pull Thermoplastic materialmdash;heat, impact and torque resistance Strong reinforcing ribs amp; rim around bottom Flame retardant Polypropylene (Rated to 221deg;F, 105deg;C) 1/2 wide Threaded plastic inserts are UL/CSA Listed Dimension Measurements = Inches UL/CSA Listed Order Qty of 1 = 1 Pc Below is more info on our Thermoplastic Conduit Bushings 6"