【Sturdy and Durable】: Metric flat threaded rivet nuts are made of high quality stainless steel. They have superior rust resistance, which can ensure a long time of use. 【Deep Thread】: These rivet nuts are knurled with deep thread inside, which are effective in fixing and anti-slip. The knurled nut makes it easy to insert into the workpiece. 【Excellent Installation Tools】: Excellent rivet nut installation tools to make the work easier and faster. 【Size and Quantity】: Type: M4 x11; Package Quantity: 100pcs. 【Widely Used】: The rivet nuts can be easily installed in many kinds of materials, including steel, plastic and fiberglass. It is a great installation tool to make your work easier and faster.