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These are extended versions if you have very thick door frame-if you have thick walls, thick door jambs, and/or thick trim. Typically, very old houses in USA and door frames in some international countries might need these Extended Vise Grip Locks. But measure first before you order: if the measurement from your door jamb (the wood piece where your door closes against) to the front of your trim is between 4 3/4″ and 6 3/4″ inches or from 12-17 cm, then you will need these extra-long extended vise grip locks. If the distance is less, then the regular size that come standard will fit your doorway. Watch this video for more information and how to measure: http://youtu.be/WcUPpUv0dSk