Devardi Glass Lampwork, 6 Hole, 2-Sided Marble Maker Graphite Marver Highest quality Marble Maker Graphite Marver, 2-Sided, 6 hole Sizes include: 1-1/4, 1, 7/8, 3/4, 5/8 and 1/2 inches. Two holes are on one side, four on the other as shown to the left. Please click the blue "Devardi Glass" above to see all our listings.