Garage door springs basically counterbalance the weight of the garage door enabling  it to easley open or close.

first one is torsion springs the second is extension springs. Garage door torsion springs come in five different designs: Standard Torsion Springs, EZ-Set Torsion Springs, Torque master Torsion Spring,   Steel Rolling Door Torsion Spring & Mini Warehouse Torsion Spring. There are also a Garage door extension springs witch includes  two designs :Sectional Garage Door Extension Springs & One Piece Garage Door Extension Springs.

Replacing garage door springs can be very dangerous and many accidents, injuries and deaths have occurred for not understanding the forces at work. Garage door springs repair should be handled by a certify garage door technician only.