Description:There are many types of bolt and nut in the kit, which can meet your different needs.The nut expands the contact area and reduce the pressure in order to protect the screws and parts.The set is made of high quality 304 stainless steel material , which is durable and anti-rust.This set has 240 nuts and 240 screws.It can be used on photo frame, wedding, digital painting, cross stitch, picture frame,signs, framed photos, bulletin boards, framed posters.Item Name: Screw SetMaterial:304 Stainless SteelScrew Thread: M2X0.4 M3X0.5 M4X0.7Size:17.6cmx10.3cmx2.3cm/6.93inx4.06inx0.91inNotes:The quantity is about 480pcs, due to manual calculation, the quantity might has 1-5pcs more or less, hope you can understand, thank you.Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:80 X Nut(M4)20 X 20mm Screw(M4)20 X 16mm Screw(M4)20 X 12mm Screw(M4)20 X 8mm Screw(M4)80 X Nut(M3)20 X 20mm Screw(M3)20 X 16mm Screw(M3)20 X 12mm Screw(M3)20 X 8mm Screw(M3)80 X Nut(M2)20 X 20mm Screw(M2)20 X 16mm Screw(M2)20 X 12mm Screw(M2)20 X 8mm Screw(M2)