Package Content: 100 (+/-2%) x Rivet Nuts; Thread Size: M3/ 0.12"Product Name: Rivet Nut; Material: Carbon Steel, Zinc Plated; Main Color: Bronze Tone; Weight: 79gFlange Size: 8 x 0.8mm/ 0.3" x 0.03" (D * Thickness) Thread Pitch: 0.5mm; Total Length: 9mm/ 0.35" Body Diameter: 5mm/ 0.2"; Application Hole Size: 4mm/ 0.16" Flat head cap screws, M3 female threaddiameter, 9mm total length, zinc plated surface, carbon steel rivet nut.This nutsert has a large flange to provide increased strength in punches and drilled holes.Knurled body provides a higher resistance to spin out when installed in soft materials.A Rivnut fastener is a tubular rivet with internal threads.It can be installed in seconds form one side of the work.Once installed, no finishing work is required on the Rivnut fastener.The added benefit of not only being a dependable fastener, they are ready to use with clean threads available for screw attachments.Blind thin sheet materials that are too thin for a tapered thread.Blind Rivet Nuts 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.How Does a Rivnut Work:A hand or power tool pull-up stud engages the threads of the Rivnut fastener and exerts a pull, causing the shank to expand tightly against the material being fastened.This step is what is called upsetting the Rivnut fastener.The specific steps as following:Step 1: Put on the rivet nutStep 2: Spin on the rivet nutStep 3: Insert into the holeStep 4: Press and upset the rivet nut, withdraw the Step 5: Install the screw boltNote:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.