Good quality materials:Metric thread,made of high quality zinc alloy, twice times higher than copper, more than 10 times higher than aluminum, processing difficult, complex production process, so that these threaded blades have the hardness of high resistance to rust, wear and corrosion-resistant environmental protection and aesthetic characteristicsUsage and install: pre-drill a proper hole, screw in with internal hex tool; Unique self-tapping designed external thread, contribute to tapping, with good tensile resistance, install with hex key, tapered external threads makes it not easy to pull out caused by vibrationWide application: suit for soft woods such as pine, plywood, fiberboard, etc., such as ready-to-assemble furniture, drawer pulls, display case, and shipping crates,have a good effect in the furniture combinationThe compartments in the box are movable, and they are are also installed underneath the box, after the tool is used up ,you can pack other things in a box, and you can freely use the compartments and recycle themMetric Threaded insert nuts set: This insert nuts assortment kit contains 7 different types nuts which are separated and stored in a neat case, you can find the appropriate size quickly.Features of insert nut: These threaded inserts are inserted into a pre-drilled hole by screwing in, in that case the external protrusions bite into the wood, preventing the nut from either turning or pulling out.Material: zinc alloycolour:copper colorPackage Contents:30 * Hex socket (M4*10) 30 * Hex socket (M5*10) 20 * Hex socket (M6*10) 15 * Hex socket (M6*15) 10 * Hex socket (M8*15) 8 * Hex socket (M8*20) 7 * Hex socket (M10*25)Only the above package content, other products are not included.Note: Light shooting 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 +/- 1-3cm.