【Advanced material】
These screws are made from a high quality black steel.The screws are treated so they resist rust and corrosion.They are high strength and will not deform or break under normal use.The aggressive screw twist pattern allows you to drive them fast and to complete your project efficiently and quickly.
The Screw is Made Of High-Quality Black Steel Material, The Surface is Treated By a Special Process, They are Strong, High Strength, Anti-Corrosion and Anti-Rust, Different Away From Ordinary Screw,it Never Deform Or Break Off.
Don't easily slip, provides good holding power in different woods and man-made materials.