The bracket works with single or double hung windows between 24 and 38 inches wide (does not work in slider; crank out or casement windows). The bracket needs 10 inches of clearance below the window The bracket requires a minimum wall thickness of 4 inches and maximum wall thickness of 11 inches. The dimension is taken from the inside lower window frame to the exterior sill or exterior surface (siding and masonry; etc. ) if no sill exists. Product Features: Installs in minutes and requires no fasteners; hardware; tools or drillingBracket works with single or double hung windows ONLY (does not work in slider; crank out or casement windows)Adjustable for different window widths; from 24-38 inches wideAvoid damage to the structure and window sills. Tested for maximum load capacity of up to 200 lbs. Safe; Durable & ConvenientSpecifications: Dimensions: 7. 1 x 25. 8 x 16. 7 inchesWeight: 10 pounds: 2 Year