REPLACE BROKEN SPRINGS：Use this pair of high quality garage door torsion springs to replace old broken garage door springs. It includes stationary and winding cones. | HIGH QUALITY PRODUCT:Made of heat treated steel coils with aluminum cones to make sure they are extremely heavy duty.Surface coated black for smoother, cleaner operation and also corrosion resistant and oil tempered for longer life. | SERVICE LIFE:For use on doors 7' or 8' high doors with 4" standard lift drums. Engineered for maximum application range. Minimum 10,000 cycles, at +/- 7.5 lbs of target door weight. | EASY TO INSTALL:We also offer a pair of unique non-slip winding bars,they will help install new or replace old, rusty springs quickly (professional installation recommended). | DIMENSION:.225” wire size x 1.75” inside dimension x 25” length.IMPORTANT:Please purchase after confirming that the outer diameter,wire diameter and length are totally the same as the original product.