SAS Fortress Hitchlock, fits Knott braked & un-braked, Albe cast & Winterhoff WW8C, WW13 & WW30 heads it can be fited when coupled-up or unhitched. Complete with maximum security lock with twin locking mechanism and hardened locking pins plus anti-drill protection on the lock, 3 high security keys supplied. Finished in zinc pacifate, Compact and easily stored. Can be used with the SAS Security Post, Insurance Approved