1. Made of 304 stainless steel material which is anti-rust and anti-corrosion. It is sturdy, durable and can be used for a long time.2. Precise size, easy to install and remove without any other complicated tools.3. Widely applied to DIY handmade, home appliances and furniture, office equipment, electronic machinery, wind power industry, etc for home, factory, laboratory etc.4. Please confirm the thread size and screw groove type before purchasing it.Specification:Product Name: Machine Screws BoltsMaterial: 304 Stainless steelModel: M4x35mm, M4x40mm, M4x50mmScrew Length: 35mm, 40mm, 50mmPitch: 0.7mmPackage Content:15pcs in total(5pcs of each size)