Specification: Material: Crystal glass and aluminum alloy Crystal diameter: Approx 1.18inch (30mm) Base diameter: 0.7inch (18mm) Total height: Approx 1.18inch (30mm) Screws size: 4*22mm Shape: diamond shaped Easy Installation: Find the position where you want to install on the board and drill a hole. Then pass through the screw from the back of board and thread tight to the knob. Application: The crystal knob is very pretty artistic and durable, Ideal for cabinet, dresser, drawers, cupboards, wardrobes, bookcase in your home, kitchen, bathroom, living-room, book-room, dorm and office. Best for decoration.