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✔ Stainless steel 304, high strength and anti-corrosion in various environments ✔ Meets/Exceeds: ISO 7380 ✔ Screw Head Style: Button ; Screw Drive Style: Internal Hex, known as hex-socket Drives; Fully Threaded ✔ These screws come in an easy-use separated girds storage box ***Specification*** Item-------------------------Head Dia.------------Head Height----------Thread Length--------Total Length M3 x 16mm------------------5.5mm/0.22"-------1.6mm/0.06"-------------16mm/0.63"-------------17.6mm M3 x 20mm------------------5.5mm/0.22"-------1.6mm/0.06"-------------20mm / 0.79"-------------21.6mm M3 x 25mm------------------5.5mm/0.22"-------1.6mm/0.06"-------------25mm / 0.98"-------------26.6mm M3 x 30mm------------------5.5mm/0.22"-------1.6mm/0.06"-------------30mm / 1.18"-------------31.6mm M3 x 35mm------------------5.5mm/0.22"-------1.6mm/0.06"-------------35mm / 1.38"-------------36.6mm ***Package Quantity*** M3 x 16mm------------------20 Pcs M3 x 20mm------------------20 Pcs M3 x 25mm------------------20 Pcs M3 x 30mm------------------20 Pcs M3 x 35mm------------------20 Pcs Total---------------------------100 Pcs ***About Internal Hex Drives*** Internal hex drives, also known as hex-socket drives, are similar to hex drives, but have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench. ***About Button head*** Button head screws are similar to standard pan head screws but have a curved top.