1.[Please Measure the Thickness of Your Shelf Before Purchasing] This under shelf storage is suitable for shelf with thicknesses between 1.5 and 2.54cm. The thickness of the shelf will affect the firmness of the product. When the thickness of the shelf is about 2.54cm, it can fit the shelf very tightly, so that the whole product will not move left and right, even if it is shaken by hand. When the thickness of the partition/shelf is about 1.5cm, it will not tilt when hung on the partition, but it can be moved left and right by hands relatively easily.This is the main reason why customers have mixed opinions about its sturdy. 2.[About Height]The storage height of this product is 3.7 inches: recommended for storing paper plates, tea bags,plastic foils wrap and office supplies such as notebooks, printer paper, spapers, or other office supplies. 3.[About Weight Capacity]The recommended weight capacity of it is 10 pounds. When you are carrying extremely heavy objects, it is recommended not to stretch it to the maximum length of 27.75 inches. Because that will cause its weight to be concentrated on a line rather than on the surface. This will cause the link point to be less stable. 4.[Assembly is a breeze] - no adhesive or screws needed. Simply slide the organizer onto a shelf and expand your storage space instantly. The durable carbon steel construction and rust-resistant coating ensure that the organizer will last for years to come. 5.[Maximize your storage space]The length can be easily adjusted from 15.18 inches to 27.76 inches, doubling your storage space and making the most of your shelves.