Material: Crystal glass and aluminum, solid structure and shiny&glittering appearance, best adornment for your home and office. Size: The knobs diameter approx 1.18inch (30mm), height approx 1.18inch (30mm) 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. Easy to Install: 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. Screws size is 0.87inch(22mm), fit up to 0.78inch(20mm) thickness. You may need to purchase screws of other length depending on your cabinets thickness. Package includes: 12 * Crystal knobs and 12 * Screws