110.9 grade alloy steel material has good strength of extension and corrosion resistance in many environments 2Countersunk head enables driving where it doesn't have sufficient space for wrenches 3Ideal for use in confined areas where the head needs to be flush or below the surface 4Used for fasteners in home and office appliance, communication equipment, ship assembly or other machinery industry 5Screws with 8 common thread lengths are well packed in 8 compartments and assorted in a transparent plastic box for convenient use and storageDescription:These flat head hex socketscrews 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.Features:1. 10.9 grade alloy steelmaterial has good strength of extension and corrosion resistance in many environments.2. Countersunk head enables driving where it doesn't have sufficient space for wrenches.3. Ideal for use in confined areas where the head needs to be flush or below the surface.4. Used for fasteners in home and office appliance, communication equipment, ship assembly or other machinery industry.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.Specifications:Material:10.9 Grade Alloy SteelColor: BlackThread Lengths: 4mm(30Pcs), 6mm(30Pcs), 8mm(30Pcs), 10mm(30Pcs), 12mm(20Pcs), 16mm(20Pcs), 20mm(20Pcs), 25mm(20Pcs)Thread Diameter: 3mm (M3)Box Size: 13 * 6.5 * 2.3cm / 5 * 2.6 * 0.9inchQuantity: 1 x Box of 200Pcs ScrewsPackage Weight: 138gType:Flat Head Hex Socket ScrewFunction: FastenerPackage Includes:1 x Box of 200Pcs Screws