Ships fast from Michigan, USA!!! These rivet nuts / nutserts are made of zinc plated steel material. This makes them very durable. This also makes them very resistant to corrosion. Rivet nuts have a smooth, burr-free surface. They are easy to use, easy to fix and have an anti slip property to them. This Nutsert has a large flange to provide increased strength in punched and drilled holes. Flat head cap screws, knurled body for anti rotation and more durable. Can be installed in many different kinds of material including steel, plastic and fiberglass. A Rivet Nut fastener is a tubular rivet with internal threads. It can be installed in seconds form one side of the work. The added benefit of not only being a dependable fastener, they are ready to use with clean threads available for screw attachments. Once installed, they are permanently attached to the mating material, allowing the associated nut to be removed in service without the risk of the fastener becoming dislodged. Also are used when an application has little or no access to the backside as they can be installed from the front side of the work piece.