Heavyduty shackle for strong security: Shackle diameter 0.63 inches made from performance steel provides extensive holding power and resistance to cut and leverage attacks. It can withstand up to 12 tons of hydraulic shear to deter theft. Safe and durable construction: The lock body is built from 0.56 inches of quality alloy steel, delivering cut, leverage, and drillresistance. A 0.10inch silicone cover protects the lock from wear and tear while preventing scratches on your bike. Enhanced key security: The lock uses a zinc alloy cylinder with two rustresistant keys. The keys feature advanced serpentine slots for added safety and security. Portable and easy to mount: The bike D lock measures 7.68 inches by 4.9 inches and includes a mounting bracket for convenient transport. It is suitable for all circular tripods with a diameter of less than 30 mm, allowing you to attach it to your bike frame or carry it in a backpack for quick access. Practical, nonflashy design: Heavy enough to deter theft yet portable enough for everyday use, providing reliable protection without adding unnecessary bulk to your ride. Use scenarios: City commuting: Lock your bike to a public rack during work or errands; the strong shackle and durable body resist common breakin attempts. Campus or gym parking: Secure your bike at dorms or fitness centers where belongings are left unattended for periods. Travel or outdoor activities: Take the lock with you on trips or outdoor rides; mount it on your bike when parked and stow it in a backpack between locations.