Specification -- Cable Length: 8.5 Feet (8 feet 6 inches/102 inches/2.59m) -- Wire Diameter: 1/8'' (3mm) or 4/32'' -- Sold as 1 pair -- Designed for all residential 7-Foot Tall Garage Door with Torsion Spring System Compatibility -- Designed for all residential 7-Foot high garage doors, compatible with most residential garage door cable drum. Compatiable cable drum model/part no.: Blesseras GD-01A-001 For Torsion Spring -- work with torsion spring & cable drum -- Each cable has a crimped straight end that allows it to slide into the notch of the cable drum and the other end has a crimped loop-designed to hook onto the bottom fixture's small knob. Not For Extension Spring System -- These cables don't have the special parts needed, such as metal plates with three holes or splice plates at the ends and usually not for securing extension springs when they breaks. Built to Last, Built to Protect -- Crafted from solid 304-grade steel 4/32'', these galvanized cable locks offer uncompromising strength and security for your garage door. And the rust-resistant chrome tension wire ensures overall garage door long-lasting performance. Blesseras 2 Pack 8 feet 6 inches Long Torsion Spring Garage Door Cable for 7 Foot Tall Garage Door, Cable Length 8.5 ft., Galvanized Steel 4/32'' (3mm)