Cost-effective Rivet Nut kit：This rivet nut set includes 139pcs rivet nuts in the most commonly needed SAE sizes: 8-32*50PCS, 10-24*45PCS, 1/4-20*30PCS, 5/16-18*8PCS, 3/8-16*6PCS; 5 different sizes to help you deal with a wide range of fasteners. High Quality Materials: VGBUY rivnuts kit is made of carbon steel, strong rust ,corrosion resistant, high strength, and non-deforming for a long time use; Zinc plated surface help prevent surface damage and fade, anti-oxidation. Easy to Install: The nutsert makes attachments easy without welding or adding heat. Our rivet nuts crushes easily even with a mini installer and it has large grip area for various thickness of metals, making installing fast and easy. Wide Application: The rivnut set makes long lasting seams and joints,suitable for the fastening field of various metal plates and pipes and other manufacturing industries.Widely used in assembly of electromechanical and light industrial products such as automobiles, elevators, switches, instruments, furniture, and decoration. Convenient Threaded Rivets: These riv nuts kit comes with a tight and durable case, which is lightweight, very convenient to carry and keep. And the thickened storage box is durable enough to accommodate all items safely. If you are asking what’s a rivnut? Typically a rivnut is a threaded insert that can be compared somewhat to a rivet in function. They are made to fit tightly into a drilled or punched hole through thin metal, and when using the proper tool a portion of the corrugated area on the outside barrel of the rivnut expands and collapses to lock itself into the hole becoming a captured nut for a bolt to be screwed into.