Stainless Steel Material: Made of high quality stainless steel, will not rust, resist daily scratches, corrosion and tarnishing. Bright surface, elegant and beautiful, comfortable to touch. For 5-6mm glass thickness: These glass door knobs are suitable for 5-6mm thick glass doors . No drilling: easy to install and remove. No need to drill a hole. Non-slip rubber grain. Usage: suitable for use on glass door in kitchen, bathroom, cabinet, wine cabinet, bookcase, etc. Package contents: 4 x stainless steel glass door knobs. Note: The data is all measured manually, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to the actual item received.