This BULLDOG AB Hitch Lock is suitable for AL-KO AK301 and AK351 Couplings and is quick and easy to fit. Manufactured from mild steel, the 3mm thick top box fully encases the hitch head and fixings. It has a highly visible red powder coated finish and utilises the Bulldog Super Lock Bolt case hardened steel locking pin which is both drill and pick resistant. It has the double security of ball socket retention and is Secured by Design (Police approved specification). It comes complete with 2 keys and a 5 year guarantee.