Description:_x000D_ 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._x000D_ _x000D_ Features:_x000D_ 1. 12.9 grade alloy steel material with oxidation surface has good strength of extension and corrosion resistance in many environments._x000D_ 2. Cap head enables driving where it doesn't have sufficient space for wrenches. _x000D_ 3. Ideal for use in confined areas where the head needs to be flush or below the surface._x000D_ 4. Used for fasteners in home and office appliance, communication equipment, ship assembly or other machinery industry._x000D_ 5. Screws and nuts are well packed in 10 compartments and assorted in a transparent plastic box for convenient use and storage._x000D_ _x000D_ Specifications:_x000D_ Material: 12.9 Grade Alloy Steel_x000D_ Color: Black_x000D_ Screw Thread Lengths: 4mm(20Pcs), 5mm(20Pcs), 6mm(20Pcs), 8mm(20Pcs), 10mm(20Pcs), 12mm(20Pcs), 16mm(20Pcs), 20mm(20Pcs), 25mm(20Pcs)_x000D_ Thread Diameter: 3mm (M3)_x000D_ Box Size: 13 * 6.5 * 2.3cm / 5 * 2.6 * 0.9inch_x000D_ Quantity: 1 x Box of 180Pcs Screws + 100Pcs Nuts_x000D_ Package Weight: 228g_x000D_ Type: Cap Head Hex Socket Screw_x000D_ Function: Fastener _x000D_ _x000D_ Package Includes:_x000D_ 180 x Screws_x000D_ 100 x Nuts_x000D_ _x000D_ Note:_x000D_ 934 on the box lable is abbreviated from DIN934, which means cap head hex socket nut._x000D_ _x000D_ The length of the screw does not include the thickness of the head of the screw.The thickness of the screw head is 2.95mm.