The 4-bar window security guard keeps intruders out and helps prevent window falls. It features 4 bars with 3.5 in. openings between the bars for child safely. It mounts inside the house horizontally or vertically, on the surface or recessed, swing or fixed mounted. Works with most single-hung, double-hung, sliding and casement windows. Adjustable in width from 24 in. to 42 in. Solid steel construction with a durable powder coat finish. Mounting hardware included for easy installation.