Kryptonite KryptoLok 912 Series 2 Chain Lock is an excellent choice for cyclists looking for a high-quality security system for their bicycle. This lock is made of 9.5mm hexagonal links of manganese steel. One of the key features of this lock is the patented end connection design, which provides extra strength and security. The integrated lock head with "talon" deadbolt is also an innovative feature of this lock, making it easy to use while providing a high degree of security. The lock comes with two stainless steel ergonomic keys and a durable, weather-resistant nylon cover to prevent scratches. Measuring 120cm in length and weighing 3.04kg, this lock is ideal for cyclists looking for a robust and reliable security system for their bike.