Do-it-Yourself Frameless Dry-erase Magnetic Glass Board is part of a customizable board system that lets you mix and match your board surfaces to suit your needs. Four brackets on the back let you hook it into the channels of the Do-it-Yourself Board Aluminum Frame (not included) that you mount to your wall with screws. The frame stays on the wall, but lets you replace a cork and/or felt panel with this 4mm thick glass board you can easily write notes and messages or even attach them to the board with magnets (not included).Do-it-Yourself Frameless Dry-erase Magnetic Glass Board is part of a customizable board system that lets you mix and match your board surfaces to suit your needs. Four brackets on the back let you hook it into the channels of the Do-it-Yourself Board Aluminum Frame (not included) that you mount to your wall with screws. The frame stays on the wall, but lets you replace a cork and/or felt panel with this 4mm thick glass board you can easily write notes and messages or even attach them to the board with magnets (not included).