These wing screws are made of 304 stainless steel, which are resistant to rust and corrosion. There are 8 optional lengths for you to choose from, which can be generally used in home and office appliance, machinery, furniture, etc. Features: 304 stainless steel material has good strength of extension and corrosion resistance in many environments. Butterfly design of the screw head will increase the lateral bearing surface and makes it eaiser to fasten. These M5 wing screws will be great replacement for industrial and construction fasteners. Used for fasteners in home and office appliance, communication equipment, ship assembly or other machinery industry. 8 optional common lengths are enough to meet your daily use. Specifications: Type: Wing Screw Material: 304 Stainless Steel Function: Machinery Industry Fastener Color: Silver Optional Screw Lengths: 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm Thread Diameter: 5mm (M5) Quantity: 5PCS Package Weight: 30~48g Package Includes: 5 x Wing Screws