Please Measure Your Post First: Our baby stair gate adapter fits Round Posts with diameters from 1.9" to 4.72", and Square Posts with widths from 1.9" to 4.72". Upgraded Baby Gate for Stairs: This retractable baby gate is specially designed to fit most stair posts, including round and square banisters, without drilling into the banister while protecting your furniture. (Installation on the wall requires drilling holes.) Retractable Design, No Tripping Hazards:The baby staircase gate expands from 0-55 inches to fit most standard openings. Standing 33 inches tall, it can effectively block toddlers and pets. When not in use, the mesh can be fully retracted for easy passage. No bottom bar and eliminating the tripping hazard. Reinforced Support Rods: Built in support rods and included floor adhesive hook work together to prevent babies or pets from crawling through the stair gate. This reinforcement ensures maximum security for your curious little explorers. Dual-Lock Safety System with Visual Indicators: Equipped with a dual-locking mechanism and intuitive red/green safety light that clearly indicate when the stairway gate is securely locked. This child proof design prevents accidental opening by little hands while allowing convenient one handed operation for adults. Versatile Indoor & Outdoor Use: Ideal for stairs, doorways, hallways, and decks—both inside and outside your home. Keep children and pets away from restricted areas and stairways. (Note: Install at the bottom of stairs for maximum safety.)