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This 35" Torsion Garage Door Spring 2-Pack is a torsion spring replacement for broken sectional garage door torsion springs. All our garage door torsion springs meet the DASMA standard rating of 10,000+ door open and close cycles. Both the winding and stationary cones are professionally installed for safe operation.Surface coated black to make sure springs won’t rust in the open air.We also provide a pair of winding bars ,they will help you finish your work easier. PACKAGE INCLUDE: 1x left-hand wind and 1x right-hand spring .250’’ wire gauge 35" coil-to-coil length 2" inner spring diameter 2x winding bars DASMA WARNING: HIGH SPRING TENSION CAN CAUSE SERIOUS INJURY OR DEATH.Professional installation is recommended. Do NOT attempt to install springs or hardware yourself unless you have the proper tools, reasonable mechanical aptitude and experience, and upper arm strength. Extension and torsion springs, along with attached hardware, are under extreme tension at all times. All tension must be released from springs before any work is performed. IMPORTANT:Please purchase after confirming that the outer diameter, wire diameter and length are totally the same as the original product.Even a little change in size can result in different performance,so please check carefully before purchasing to avoid waste.