Premium material: the impact nuts are made of excellent galvanised carbon steel material with smooth edges and high hardness, which is not easy to deform, corrosion resistance, good fixing effect and can be easily screwed in. Easy to useUse insert nuts, drill a proper hole, screw it in with an Allen tool; unique self-tapping male thread that contributes to thread cutting and provides a strong, durable thread for wood and wood materials. Easy to store: the 230 pieces screw-in sleeves are stored according to type in a transparent storage case for quick access and protection. The conical male thread makes it difficult to pull out due to vibrations. Wide ApplicationsThe screw nut can be installed in many different materials, including steel, plastic, fiberglass, softwood etc. Mainly used for the connection between furniture, wardrobes, sofas, beds, cabinets, wooden doors, chairs and other household items. What you get: you will receive 230 screw-in nuts of 11 sizes, including M4 x 8 - 30 pieces, M4 x 10 - 60 pieces, M5 x 10 - 45 pieces, M6 x 8 - 18 pieces, M6 x 10 - 32 pieces, M6 x 13 - 13 pieces, M6 x 15 pieces. -12 M8 x 15 - 10 pieces, M8 x 20 - 5 pieces, M10 x 15 - 3 pieces, M10 x 25 - 2 pieces, enough for your daily use.