The Capstone Series 90 is the most economical choice in aluminum windows. Its self-mulling frame eliminates the need for separate vertical and horizontal mulling components and it has a nylon roller system for easy opening and closing. Sloped sill for traditional look of home exterior and for optimal water drainage. Integral pre-punched nail fin for new construction. Anti-lift out prevents the removal of operating sash from the exterior. Screen and ventilating panel are easily removed from the inside of the home. Glazed mill finish. 1-7/8" frame depth.