براغي رأس أسطوانية بمقبس سداسي 2-4-1/2 × 20 بوصة، خيط جزئي، فولاذ سبائكي، أكسيد أسود حراري

The hex socket drive gripped my Allen key perfectly, and the black oxide finish looks clean and corrosion-resistant. These 20-inch screws fit our assembly jig without any binding—solid quality for the price.

Installing these in a jig was a breeze—the hex socket drive gripped perfectly and I didn't strip a single head. The black oxide finish seems like it'll hold up well in my workshop. Exactly what I needed for precision assemblies.

The partial threading on these 20-inch screws made aligning them in my jig setup way easier than fully threaded ones, and the hex socket drive grabbed cleanly without stripping. The black oxide coating has a nice matte look that doesn't smudge fingerprints everywhere.