Vintage Clear Crystal Molded Glass Dinner Master Knife Rest. This is a medium-sized knife rest. The crystal knife rest is a hexagon dumbbell shape. Great condition. The knife rest is 4-inches in length from end to end. The center of the dumbbell is 5/8-inch in width. The width of the hexagon on the end of the knife rest 1 1/2-inches. X-0267 (2)