The work is concerned with the comparison of the assurance instruments anchored in the law environment of the Czech Republic. The work is dealing with the importance of the assurance instruments and sets up its own criterions of efficiency used for the main comparison. The following chapters analyze individual reinsurance tools such as lien, right of retention, warranty, bank warranty, penal clause, conveyance of title and recognition of engagements. The most important aspects of the efficiency are the substance of reinsurance instruments, their law power, their area of application, their economic efficiency and some aspects regarding time delays. The last chapter compares all of these assurance tools according to the above mentioned criterions.