The oxford sentinel shackle duo lock 320 with cable is a silver sold secure rated lock combo which is ideal for a mid to high valued bike in a mid to high risk area with a hardened steel 14mm shackle lock the lock easily gains its silver sold secure status the lock has been primarily constructed from hardened steel which gives the lock its heavy duty and solid feel the lock also features a high tech pick resistant locking system keeping those pesky thieves at bay