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Description: These cap head hex socket screws are made of 12.9 grade alloy steel with oxidation surface, which are resistant to rust and corrosion. There are 9 thread lengths for you to choose from, which can be generally used in home and office appliance, machinery, furniture, etc. Specifications: Material: 12.9 Grade Alloy Steel Color: Black Screw Thread Lengths: 4mm(20Pcs), 5mm(20Pcs), 6mm(20Pcs), 8mm(20Pcs), 10mm(20Pcs), 12mm(20Pcs), 16mm(20Pcs), 20mm(20Pcs), 25mm(20Pcs) Thread Diameter: 3mm (M3) Box Size: 13 * 6.5 * 2.3cm / 5 * 2.6 * 0.9inch Quantity: 1 x Box of 180Pcs Screws + 100Pcs Nuts Package Weight: 228g Type: Cap Head Hex Socket Screw Function: Fastener Package Includes: 180 x Screws 100 x Nuts Note: 934 on the box lable is abbreviated from DIN934, which means cap head hex socket nut.