ETRONIC Security Lock M4 Self Coiling Cable Lock, 4-Feet x 5/16-Inch SPECIFICATIONS: 4' (1.2m) by 5/16" (8mm) diameter. VERSATILE USE: For indoor and outdoor use; Cable locks are best used for bicycles, ladders, lawn mowers, and sports equipment. DESIGN: Protective vinyl coating prevents scratching. KEYLESS: Combination locking mechanisms for keyless convenience. SECURE CABLE: Flexible steel cables for strong cut resistance. Preset combination.