Abstract: The present invention relates to a security system intended to prevent theft of theft-prone items. The security system comprises a retainer means intended to be mounted against a floor and/or a wall by means of fastening means, which retainer means defines a space for a storage means provided with a handle or not provided with a handle. The retainer means comprises two mutually parallel sides connected by means of a side perpendicular to said two sides. The security system further comprises a lock means connected to a first of the two parallel sides of the retainer means by means of joint means, which lock means is provided with a hole in which a locking pin arranged on the second of the two parallel sides fits. Furthermore, the security system comprises a locking means intended to be locked on the locking pin to secure the lock means and thereby the storage means.