Installs without compromising the structure. No drilling or welding required; simply compress the device between the vertical sides of the door or window and tighten. Fits door or window sizes ranging from 21 1/2" to 51 1/2" wide for complete jobsite flexibility. Lightweight and extremely portable design weighs only 22 lbs. for easy transport and use. Rated for 3,600 lbs. Meets all OSHA requirements for fall arrest rated anchorages.