Grifema Ga1201-12 Bike Chain Lock With Key, BlackwhitegRIFEMA gA1201-12 Bike chain Lock with Key, BlackWhiteFeatures of Grifema Ga1201-12 Bike Chain Lock With Key, Blackwhite HIgH ANTI-THEFT]: Its hard to break through as the lock cylinder of the bike lock is made of zinc alloy, chain 7mm diameter, weighs 795g, drill-resistant and anti-tech unlocki..