The Ninbgo Bigood BTP wedge anchor in the range of M8, M10, M12, M16, M20 and M24 is an anchor made of galvanised steel. The Ningbo Bigood BTP-G wedge anchor in the range of M8, M10, M12, M16 and M20 is an anchor made of sherardized steel. The Ningbo Bigood BTP-X wedge anchor in the range of M8, M10, M12, M16 and M20 is an anchor made of galvanized steel. The Ningbo Bigood BTP-A4 wedge anchor in the range of M8, M10, M12, M16 and M20 is an anchor made of stainless steel. The anchor is installed into a predrilled cylindrical hole and anchored by torque-controlled expansion. The anchorage is characterized by friction between expansion clip and concrete.