Features Made of 304 stainless steel, which ensures strength, it has a robust body without rusting properties. The adapter is the piece that plugs between the individual nut insert and the nose of the installation tool. It is not the tool. With open end, small flange, round hole, threaded inner wall and partially non-slip surface, this flat head rivet nut has good performance of fixing function. The rivet screw often has a built-in feature, such as a slot to help tighten the fastener. There are different sizes to choose from, M3, M4, M5, M6, M8, and it is usually chosen because of its low profile compared to other nuts. Description: With open end and small flange, this flat head rivet nut provides good mounting performance. The rivet nut often has a built-in feature, such as a slot to support tightening of the fastener. It is usually chosen for its low profile compared to other nuts. And this blind rivet nut is the piece that comes between the single nut insert and the nose of the mounting tool. Specifications: Material: 304 stainless steel. Colour: silver. Size: M3, M4, M5, M6, M8 (optional) Type: flat head rivet nuts Item quantity: 20 pieces. Package weight: 20-120 g. Box contents: 20 x blind rivet nuts Package List