1-8 × 13" براغي ذات قبعة مقبس | محرك سداسي المقبس | ملولبة جزئيًا | سبيكة فولاذ أكسيد أسود حراري

The black oxide finish handled the machine oil and occasional bump without a single rust spot, and the threading was clean all the way down. These are going to be my go-to for any heavy fixture work from now on.

Perfect fit for my jig setup—the hex socket made driving them into tight spots a breeze. The black oxide finish looks clean and seems tough, and the 13-inch length was exactly what I needed for a deep hold.

The partially threaded design made these screws much easier to align in my milling fixture than fully threaded ones would have been. The black oxide finish seems durable and clean too.