Adjustable winter cover, you can drill holes in order to make it fit right. The pool cover is made of aging-resistant, supple but sturdy polypropylene and is high temperature and abrasion resistant. This inground pool cover has a solid reputation for providing reliable service. This pool cover is also available in a variety of sizes to fit your specific inground pool. Whether you need a 12-foot, 14-foot, 16-foot, or an 18-foot inground pool cover, this model has you covered - there are several options available. Technical Features: 1. Size of Suitable Pool: 18 x 36 ft. 4x8 foot center step size 2. triple-stitched throughout, double-strapped. 3. Stainless steel springs and brass anchors are included with the pool cover. PROS🟢 All hardware is included With its tight mesh structure, this pool cover can effectively prevent pets, domestic animals, and children from accidentally drowning in the water. CONS🔴 The instructions are not very clear