The Index SLPT heavy duty anchor in the range of M6, M8, M10, M12, M16 and M20 is an anchor made of galvanised steel. SLPT anchor comes with hexagonal head and SLPC anchor comes with countersunk head. The anchor is installed into a predrilled cylindrical hole and anchored by torque-controlled expansion. The anchorage is characterised by friction between the expansion tube and the concrete.