Roof anchors create an anchoring point to secure a connecting device such as a lanyard or SRL when working at height. Permanent-installation and single-use roof anchors can only be installed once in one location. Permanent-installation anchors are left in place for reuse as long as the anchor passes inspection. Single-use anchors are installed for one use and immediately removed. Reinstallable roof anchors can be left in place for as long as needed and can be removed and reinstalled in a new location when the work is done. Mobile roof anchors are used on flat concrete and asphalt roofs and can be moved around the roof as needed.