Designed for use with 1" and 1-1/2" (25 and 38 mm) foam board. Vent holes 1/8" (3 mm) diameter. Vented area is 2-5/8" (67 mm) wide. Extra wide mounting flanges make attachment to sheathing easier. Wide flange has 1/8" (3 mm) stops with striations to provide positive bond of the base coat and mesh assuring proper finish thickness.