Description: Sharp Tail Design: The sharp tail design allows for quick and installation, improving work efficiency. These Hex Washer Head Screws are particularly suitable for connecting steel structures in the construction industry, ensuring stability and of the structure.Deep Thread Design: The Self Tapping Screws with deep thread design provides stronger biting force, ensuring a secure connection that won't loosen over time.Bi Metal Composite Material: Bi Metal Self Drilling Screws are made from 304 stainless steel and 435 alloy steel, combining the rust resistant properties of stainless steel with the high hardness of alloy steel, these screws are ideal for use in steel structure construction.these screws offer exceptional strength and durability.Anti Rust Coating: The surface of the screws are treated with an anti corrosion coating to ensure they do not rust even when used in harsh environments for extended periods.Washer Included: Each Hex Washer Head Sheet Metal Screw comes with a washer to provide better sealing performance, preventing water and dust from entering the connection point. Specification: Material: Stainless Steel Alloy Steel Size Chart: 0.55cmx3.2cm/0.22inchx1.26inch Package Includes: 50Pcs Hex Washer Head Screws Note: Please allow slightly errors 1-2cm differences due to manual measurement.