Prime-Line 18 in. L 150 lb Garage Door Torsion Spring

Most doors, in recent years, have been supplied with torsion springs; located directly above the door and mounted to the header. Replacement will require the use of 2 – winding rods (GD-52238) and a clear understanding of wire size and handing.1-3/4 in. inside diameter with .207 wire size,Left hand wind,Requires the use of 2 winding rods for replacement