Upgrade Material: Our folding lock with keys is made of high tensile steel, which is hard, shearing and shear resistant and withstands high torsion and tension. It has a high level of flight, fracture, cut and manipulation functions. The very safe bike lock gives your bike security. Intelligent Folding Design: The bike lock weighs 700 grams and has a total length of 83 cm. It consists of 26 joints that can be rotated 360 degrees. After folding, it is only 6.6 x 7.5 x 5.5cm (L / b / h), which can be operated live with one hand. The shell is made of ABS plastic which perfectly protects the bike from scratches. Portable and Easy to Use: The folding lock with bracket can be attached to the seat post with a non-slip velcro fastener, or it can be fixed to the bike frame with screws. As soon as it is attached, the bike no longer rattles, even if you ride on bumpy streets. It is very suitable for mountain bikes, racing bikes, E scooters, etc. to protect your bicycle security anytime and anywhere. 2 Keys: The high security level of the bicycle castle has 2 keys, one of which you can carry for daily use and leave the other at home if you accidentally lose one.