Description: Well made of premium 410 stainless steel which is one of the highest forms of steel, making it last longer than other hardware head screws give you a flush surface when used with countersunk holes, also they are strong with heads that do no strip easily, great for outdoor and even salt water use Designed with Self tapping feature to eliminate paint build-up, weld flash, or foreign material that may occur in pre-drilled or pre-punched holes Also used to make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood 100% Brand New with Premium quality, 50 Pieces in each package, meeting your needs in various projects Specification: Material: 410 Stainless Steel Head Type: Head Head Diameter: approx. 10.7mm / 0.31 Inch Head Height: approx. 2.1mm / 0.12 Inch Thread Diameter: approx. 4.2mm / 0.16 Inch Thread Length: 13mm/16mm/19mm/25mm/32mm/38mm/50mm Package Includes:(3 Pack) 50 Pieces Head Self-drilling Screws