1、10.9 grade alloy steel material has good sength 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 indusy 5、Screws with 8 common thread lengths are well packed in 8 compartments and assorted in aansparent plastic box for convenient use and storageMicrosoft YaHei';color:#009900;Description: Microsoft YaHei';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. Microsoft YaHei';color:#009900;Features: Microsoft YaHei';1. 10.9 grade alloy steelmaterial has good sength of extension and corrosion resistance in many environments. Microsoft YaHei';2. Countersunk head enables driving where it doesn't have sufficient space for wrenches. Microsoft YaHei';3. Ideal for use in confined areas where the head needs to be flush or below the surface. Microsoft YaHei';4. Used for fasteners in home and office appliance, communication equipment, ship assembly or other machinery indusy. Microsoft YaHei';5. Screws with 8 common thread lengths are well packed in 8 compartments and assorted in aansparent plastic box for convenient use and storage. Microsoft YaHei';Specifications: Microsoft YaHei';Material:10.9 Grade Alloy Steel Microsoft YaHei';Color: Black Microsoft YaHei';color:#009900;Thread Lengths: 4mm30Pcs, 6mm30Pcs, 8mm30Pcs, 10mm30Pcs, 12mm20Pcs, 16mm20Pcs, 20mm20Pcs, 25mm20Pcs Microsoft YaHei';Thread Diameter: 3mm M3 Microsoft YaHei';Box Size: 13 * 6.5 * 2.3cm / 5 * 2.6 * 0.9inch Microsoft YaHei';color:#009900;Quantity: 1 x Box of 200Pcs Screws Microsoft YaHei';Package Weight: 138g Microsoft YaHei';Type:Flat Head Hex Socket Screw Microsoft YaHei';Function: Fastener Microsoft YaHei';Package Includes: Microsoft YaHei';1 x Box of 200Pcs Screws