Exo Terra Terrarium Combination Lock Crafted from excellent materials and designed to the highest standard, it will make sure that your reptile is locked safely into his terrarium. The lock will fit every door of every size in our terrarium collection, which are fantastic homes for a variety of invertebrates and reptiles. Built from superior quality glass, with a ventilation panel and sturdy frame, our own terrariums are a great product at a great price. Make sure you take a look at the corresponding Light Hood, also tailor made to fit the terrarium range! Each lock arrives already pre-set with an unlock code of 0-0-0. While this is fine for your reptile, if you want to keep other people out, like children in your home, you are going to want to reset it. First, make sure that it is still set to 0-0-0 by twisting the combination lock to this setting, then press the release button on the side of the lock, causing the wire lock to spring open. Once this is done, use a pen to push in the reset button found at the bottom of the lock. While this is pressed in, rotate the dials to your preferred 3-digit code and then release the reset button. Then lock the unit again. The lock should now only release when your new 3 digit code is inputted on the dials and the release button is pressed.