Description:_x000D_ These flat head hex socket screws are made of 10.9 grade alloy steel, which are resistant to rust and corrosion. There are 8 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. 10.9 grade alloy steel material has good strength of extension and corrosion resistance in many environments._x000D_ 2. Countersunk 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 with 8 common thread lengths are well packed in 8 compartments and assorted in a transparent plastic box for convenient use and storage._x000D_ _x000D_ Specifications:_x000D_ Material: 10.9 Grade Alloy Steel_x000D_ Color: Black_x000D_ Thread Lengths: 4mm(30Pcs), 6mm(30Pcs), 8mm(30Pcs), 10mm(30Pcs), 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 200Pcs Screws_x000D_ Package Weight: 138g_x000D_ Type: Flat Head Hex Socket Screw_x000D_ Function: Fastener _x000D_ _x000D_ Package Includes:_x000D_ 1 x Box of 200Pcs Screws