Common adjustable ranges shown in listings include 14.25"–37", 19"–51", and 22"–44" (note: one listing specifies a 39.25" max when using door caps). Some products are sold in fixed lengths such as 20.75", 31.5", 37", and 51".
Most listings describe the bars as metal (steel or high‑grade iron) with plastic parts in some models and rubber components (end caps or bottoms) for protection and grip.
They are primarily designed for sliding windows and sliding doors. Several listings also describe compatibility with patio sliding doors and some hinged doors, but fit can vary by model.
Listings commonly cite rubber end caps, notched rubber tips for fitting around knobs or levers, and angled rubber bottoms that provide full contact and grip without scratching frames or floors.
Typical adjustability features include notched rubber tips to fit around door knobs or levers, an angled rubber bottom to make full contact on uneven floors, and telescoping length adjustment to fit a range of widths and heights.
