What size houdini lock should I buy?

Hi Sumari, thank you for your inquiry, the Houdini door comes in two sizes so we would suggest measuring your door to see which would be the best fit. We hope this helps. if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.