The Walraven WT1 ST wedge anchor in the range of M8, M10, M12, M16, M20 and M24 is an anchor made of galvanised steel. The Walraven WT1 SH wedge anchor in the range of M8, M10, M12, M16 and M20 is an anchor made of sherardized steel. The Walraven WT1 wedge anchor in the range of M8, M10, M12, M16 and M20 is an anchor made of galvanized steel. The anchor is installed into a predrilled cylindrical hole and anchored by torque-controlled expansion. The anchorage is characterised by friction between expansion clip and concrete.