Please read the complete description before purchasing it. Please see the pictures and learn how it works before purchasing this product. Use only when the combined thickness of rug (overlay) and carpet/mat (underlay) is 1 inch or less. Make sure the combined thickness of overlay and underlay do not exceed a total thickness of 1 inch, as our rug settlers work best for that thickness. If there is a bump after inserting it or you see it higher than the rug surface, you have not inserted it correctly. These pins actually run from the top rug to the underlying carpet and keep the both along with each other. The picture explains it well. Please note that you will have to push hard the strong pins of the product through the rugs. Some rugs are too thick that you may have to need a nose pliers to push the pins. The top portion is contoured according to the fingers to offer more grip while pushing it Large rounded margins make it user friendly and clear surface makes it less visible. Please note that you will have to push hard the strong pins of the product through the rugs. Some rugs are too thick that you may have to need a nose pliers to push the pins. Designed for rug + carpet combinations up to 1 inch total thickness. Not recommended for shag or extra-thick rugs. How to Use: 1. Place your rug over the carpet or mat. 2. Hold the Rug Settler Pin at the edge and press firmly until the pin passes through the top rug into the carpet beneath. 3. If your rug is very thick, you may need pliers to push the pin fully. 4. When inserted correctly, the pin will sit flush with the rug surface. If it sticks up, push further or adjust placement.