Package Include -- Taper Spring x 20pcs Material -- 304 Stainless Steel, anti-corrosion, not easy to rust, durable, reusable for a long service time. Specification -- Wire Diameter x Small Diameter - Large Diameter x Height Size -- [0.5x3-7x8.5mm] Various Application -- Widely used for Home repair and tool replacement, DIY project, electronic product, toys, industry, machinery and so on. Package Include -- Taper Spring x 20pcsMaterial -- 304 Stainless Steel, anti-corrosion, not easy to rust, durable, reusable for a long service time.Specification -- Wire Diameter x Small Diameter - Large Diameter x HeightSize -- [0.3x2.5-4.5x5mm] , [0.3x3.5-6.5x10mm] , [0.5x3-7x8.5mm] , [0.7x5.6-10x12mm] , [0.7x6.5-14x15mm] , [0.8x12-20x30mm]Various Application -- Widely used for Home repair and tool replacement, DIY project, electronic product, toys, industry, machinery and so on.