【Standard SAE Sizes】: 300pcs rivet nuts with various sizes in a transparent box, it contains 5 sizes selected for you, includes: #8-32 x 90pcs, #10-24 x 90pcs, 1/4''-20 x 84pcs, 5/16''-18 x 20pcs, 3/8''-16 x 16pcs. 【Reliable Quality】: Made of zinc plated carbon steel material, the rivet nuts have high hardness and great corrosion resistance, which are Long-lasting and non-deforming; Zinc plated surface help prevent surface damage and fade, anti-oxidation, healthy and lead-free, high strength, load-bearing threads.【REASONABLE DESIGN】: Our rivet nuts are knurled having flat and deep thread, which are easy to fix and anti-slip effective. 【Wide Range of Uses】: Widely used in automotive, furniture, decoration, electrical and industrial products, suitable for a variety of occasions, it can be used in air conditioning, fire fighting, gas, etc and can also be used in medicine beverage food chemical industry and metal sheets. 【Convenient to Use】: The Rivet Nuts set come with exquisite box with size and model label. Easy to carry and better storage.