Exterior and Interior Frames are exact replacements for the window frames used by most entrance door manufacturers. Easy to replace, no special tools required. Measures 21 H x 12 W from inside edge to inside edge. These frames have 12 screw holes for attaching. Glass & replacement screws sold separately Overall frame Dimensions: 15.75 inch x 24.75 inch; Glass Dimensions: 12 inch Width x 21 inch height | Valterra RV Entrance Door Window Frames - Exterior Black