Description:Material: Carbon steel, galvanized100pcs packing size: 13.2*7*2.3cm165pcs packing size: 20.2*11*3cm210pcs packing size: 19*13*3.6cm Features:1. Rivet nuts can be installed in many different types of materials, including steel, plastic, and fiberglass.2. The flat cap rivet has an open end, a small flange, a round hole, a threaded inner wall and a partial non-slip surface, so it has good fastening performance.3. Easy to install, designed to create a bump on the back of the panel when the screws are tightened.4. Lighter weight, no need to fix the pallet nut with the rivet in advance, the riveting is strong and efficient, and it is easy to use. Packing List:100pcs Packing List:-Size: M3/M4/M5/M6/M8-Quantity: 30/30/20/10/10pcs per box165pcs packing list:-Size: M3/M4/M5/M6/M8/M10/M12-Quantity: 55/40/30/20/10/5/5pcs boxed210pcs packing list:-Size: M4/M5/M6/M8/M10/M12-Quantity: 65/50/40/30/20/5pcs per box