This security bolt is specifically designed for secondary doors and can even function without a cylinder. Secondary doors such as cellar, storage, or garage doors are popular entry points for burglars. The security bolt has been specially developed for use on these doors and is suitable for widths ranging from 85 to 100 centimeters. The unique feature: this model operates without a key. The bolt is controlled from the inside using two red push buttons. However, the absence of a key does not mean a lack of security. With its special locking mechanism, the product closes reliably and offers high resistance.