- Safe and durable installation: this cavity dowel opens its expansion arm to press firmly on the back of the wall plate, allowing you to install and remove screws many times without loosening or reducing load capacity. - Secure hold and reuse: the cavity dowel provides a reliable hold every time. the internal metric thread supports multiple installations and disassembly without affecting load capacity. - High quality materials: the hollow dowel metal is made of galvanised carbon steel, rust and corrosion resistant. the handles are non-slip PVC rubber and allow one handed operation. - Wide compatibility and applications: suitable for M4/M5/M6 flower nuts, for attaching photo frames, mirrors, towel holders, curtain rods and other items to hollow walls such as plasterboard, plaster fibreboard and aluminium alloys of 0-5 mm, tinplate etc. - Practical use scenarios: hang a lightweight photo frame on plasterboard; mount a towel holder or curtain rod on hollow walls; fix lightweight shelves or decor items to plasterboard or tinplate walls.