Check the listing for details. 30Pcs M6x18mm Jack Nuts, Carbon Steel Threaded Insert Petal Nuts, Silver. Condition: New. Listed at 15.65 USD. Description:Size & Package - The package includes 30 pieces of expansion nuts, ensuring sufficient quantity for various installation applications and providing a secure and durable fastening effect. The nut size is 16 x 5.3 x 18mm / 0.63 x 0.21 x 0.71 Inch (Head Dia. x Base Dia. x L) and the flange thickness is 2 mm / 0.08 Inch.Wide Application - The rivet nuts are suitable for most applications, especially for thin or hollow materials where traditional fasteners difficult to handle, such as aluminum alloy, steel pipe, iron sheet and acrylic plate, for hanging curtain rods, hollow doors, metal frames, wall cabinets, wall panels, coat racks, license plates and container labels, etc.Easy to Install - The petal nuts are designed for hand and air tools, and are simple to install.