60pcs 1/4-20 304 staineless steel rivet nuts kit with a storage box.
A rivet nut, also known as a blind rivet nut, or rivnut,it is a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. It is a kind of threaded insert.
Material:304 stainless steel;head type:flat
Grip Range: 0.7mm-4mm / 0.027"-0.125"; Body Diameter: 8.7mm / 0.34"
Total Length: 14.9mm / 0.58"; Suit for Hole Size: 0.351"-0.356",Size is measured by hand