STK prides itself on being one of the safest tower crane companies in the world. In 2004 we were the first tower crane rental company in the Netherlands to receive the SCC* Certificate. In 2012 we received the SCC Petrochemical Certificate as well as the internationally renowned OHSAS 18001 Certificate. In 2014 we decided not to renew our SCC Petrochemical Certificate out of practical and economic reasons and chose to go back to SCC** instead. We can, however, upgrade our safety level to the SCC Petrochemical Certificate at any given time.