How powerful are the magnetic keys? Jessica 28 June 2022 11:11 Aycorn's strong magnetic keys will operate through doors up to 38mm (1.5″) thick. Related articles How do I install the Magnetic Safety Cupboard Locks? Can the locks be set to an 'always open' mode if there is no need to use the magnetic key for some time? Where can I purchase extra magnetic keys for my locks? User Manual Click here to see our cupboard locks Comments 0 comments Please sign in to leave a comment.