2. Anti-theft double brass disc case from both inner side and outer side to avoid technically opening,high strength,high accuracy,anti-rust,high durability
3. 3 double disc anti-theft brass keys with unique shape as well as waterproof
4. Stainless steel shackle,anti-cuting, anti-sawing,anti-prying stainless steel shackle spring
5.Snake shape anti-theft brass double discs to make it more accurate and secure
6.Brass discs, more durable,h
igh security
