Apparatus for releasing a magnetic security device used to inhibit unauthorised access to and/or unauthorised removal of an article. The apparatus has a first portion (1) for locating an article in a first direction (D1) and a second portion (2) for locating an article in a second direction (D2) perpendicular to the first direction (D1), so providing an L-shaped slot or receptacle capable of receiving articles of a wide range of shapes and sizes having a security device installed adjacent two substantially perpendicular sides thereof. The first and/or second portions include magnetic release means for releasing a lock securing the security device to the article and arranged to assist in locating the article in a third direction (M) perpendicular to the first and second directions (D1, D2) by magnetic attraction of the security device as the article is brought into contact with the first and second portions to align the magnetic security device with the magnetic release means.