M8 x 20mm, thread length: 20mm, pitch size:1.25mm, thread diameter: M8 The Button head socket cap screws also called allen hex drive . they are made by stainless steel 304 which offers a high level of chemical and corrosion resistance. The Button head socket cap screws are not only used for the installation of switch sockets, TV stands and shelves, but also commonly used for the maintenance of various electronic products, household appliances and furniture. Package Included: 10 x Button Head Socket Screws Ideal for professionals, hobbyists, landlords, maintenance workers and DIY people. These screws come in a variety of head shapes, which determine how the screws interact with the mating surface and how they are driven. Made of stainless steel 304 (18-67), it provides good strength and corrosion resistance in harsh environments.