The cavity metal dowel HM-S from fischer is a versatile cavity dowel with a metric screw for all panel building materials. The dowel is inserted using the fischer HM-Z 1 assembly pliers in the pre-positioned assembly. The pliers are used to pull the dowel in the cavity against the panel building material. The spreader arms fold up and press against the back of the plate. Alternatively, assembly with a screwdriver or cordless screwdriver is also possible. The fischer cavity metal dowel HM-S is suitable for attaching lights, towel rails and curtain rails in the interior.