5/16-18 X 4" 機械螺絲 | 橢圓頭十字槽 | 18/8 不鏽鋼 (100 / 包)

Used a handful to mount some outdoor shelving brackets, and not a single one stripped during driving. The 4-inch length gave plenty of bite into the studs, and the stainless finish is holding up well in the rain so far.

I needed extra length for a custom metal shelf project, and these 4-inch screws grabbed the threads perfectly without stripping. The oval head sits flush on the surface, and the 18/8 stainless gives me peace of mind for occasional outdoor use.

The Phillips head on these 4-inch stainless screws drives smoothly without stripping, which is a relief when you’re working in tight spaces. Used a dozen of them to secure a metal bracket outdoors, and the corrosion resistance seems solid so far.