This set of round security roses with an extra protection against burglary is SKG*** approved. The security hardware is made of stainless steel and finished in matt black. Equipped with core pull protection, which protects the cylinder against pulling and drilling out the cylinder core. Key pull protection has been mandatory in new construction since the end of 2013 and for existing construction since April 2014. The security hardware is also SKG*** approved, which means that it is extra heavy burglary resistant hardware.