HEAVY DUTY MAGNETS 4 PACK HIGH STRENGTH MAGNETS PROVIDE EXTRA HOLDING POWER FOR ANY STEEL SURFACE. CAN BE USED ON GLASS BOARDS WITH A 3/16"" OR LESS THICKNESS. ROUNDED SHAPE FOR EASY GRASP. COMES IN PACK OF 4. IDEAL FOR USE WITH GLOBAL INDUSTRIAL GLASS DRY ERASE BOARDS 48""L X 36""H - A HREF""HTTP//WWW.GLOBALINDUSTRIAL.COM/P/OFFICE/BOARDS/WALL-MOUNTED/MAGNETIC-GLASS-BOARD-48-X-36"" TARGET""BLANK""695260/A 72""L X 48""H - A HREF""HTTP//WWW.GLOBALINDUSTRIAL.COM/P/OFFICE/BOARDS/WALL-MOUNTED/GLOBAL-INDUSTRIAL-GLASS-BOARD-72-X-48"" TARGET""BLANK""695259/A