DESIGN- Designed with stainless steel material, the Stainless steel material provides strength and offers good corrosion resistance in many environments. FUNCTION- Fixing component, industrial and construction fasteners.Used widely in the home and office appliance, communication equipments, ship assembly and other machinery industry Total including 240PCs all kinds of screws the nuts,which can satisfy the basic requirement for manual work. DETAIL- There is a latch that is easy to lock into place so you can sure 't come open and spill the contents. Material: Stainless Steel Color: Silver Model(inside diameter): M3 M5 M6 M8 Screw size(inside diameter and column length): M3x3mm 20pcs M4x5mm 20pcs M6x10mm 20pcs M3x4mm 20pcs M4x6mm 20pcs M8x8mm 20pcs M3x5mm 20pcs M5x5mm 20pcs M3x6mm 20pcs M5x8mm 20psc M4x4mm 20pcs M6x6mm 20pcs 1. High hardness and will not deform 2. Durable and does not rust 3. High-grade and practical 4. Wear-resistant and anti-corrosion Package Contents: 240x Screws 5x Wrench(M3 M5 M6 M8) Only the above package content, other products are not included. Note: Light 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.