It is allow to provide the following forms of collateral:

– Cash or immobilization certificates bearing securities deposited with the Government Depositary or the Delegations of Economy and Finance of the Autonomous Communities or contracting local.

– By bank guarantee provided by a bank, savings bank, credit union, credit institution or mutual guarantee.

– By surety contract, concluded with an authorized insurer.

– By holding in price when specified in the specifications.

The guarantee of a bank´s bond and a surety bond is the same. (Royal Decree Law 2/2000 of 16 June, approving the revised text of the Law 13/1995 of May 18, the Public Administration Contracts). Spain.