210pcs rivet nuts with various sizes in a durable transparent box, it contains 6 sizes selected for you, includes:65 x Rivet Nuts(M4), 50 x Rivet Nuts(M5), 40x Rivet Nuts(M6), 30 x Rivet Nuts(M8), 20 x Rivet Nuts(M10), 5 x Rivet Nuts(M12) These kit is lightweight, very convenient to carry Meanwhile, the transparent storage box is durable enough to accommodate all items safely. The assorted nutserts are widely used in automotive, furniture, decoration and other electrical and industrial products, suitable for a variety of occasions such as in air conditioning, fire fighting, gas or in medicine beverage food chemical industry and metal sheets factory. Rivet nuts are made of carbon steel, strong rust and corrosion resistant for a long time use Zinc plated surface help prevent surface damage and fade, antitooxidation, healthy and leadtofree, high strength, nontodeforming, loadtobearing threads