M5 X 30mm 六角穴付き止めねじ（カップポイント） | 316 ステンレス鋼 (250個/袋)

Used a full package of these on a marine railing repair and not a single one stripped or corroded after months of salt spray. The 316 stainless is exactly what I needed, and the cup point grips the shaft firmly without chewing it up. Torqued them down in awkward spots with a ball-end hex key, no pro

Installed these to hold a jig in place, and the cup point bites nicely without slipping. The hex drive makes it easy to tighten in awkward spots, and the 316 stainless feels solid.

The hex socket drive made torquing these M5s down in a cramped spot way easier than fiddling with a standard wrench, and the 316 stainless feels solid against rust. I do wish the cup point bit was a touch sharper, but for the price per piece, they've held fine so far.