With the setting tool II i fountain pen M 8 and M12 is the high performance internal thread Anchor FH II 12/M8 I and FH II 15/M12 L Zulassungskonform. For the installation, you may use a setting tool is to be tensioned The Cone The FH II i shape in the expansion, and these against the wall of the borehole. At the same time contract so you have the anchor thanks to the compression of the black plastic rings. So that is the anchor sleeve Zulassungskonform under the edge of the hole.