Extension springs are under extreme tension when the door is down and or operation.
Your door is closed for the majority of the time and when the door is in the down position the springs are fully charged and at their most dangerous.
When, not if, a cable or springs breaks and safety cables are not present the charged spring becomes a potentially deadly projectile.
I have seen instances of an extension spring actually traveling through garage walls.
Unfortunately I have done repairs after someone was hurt by a flying extension spring.
I cannot stress enough the need of having safety cables on any and all extension spring garage doors.
THIS KIT WILL WORK ON 7’ OR 8’ TALL GARAGE DOORS
INSTALATION INSTRUCTIONS HERE