3/8-16 × 5-1/2" براغي ماكينة | رأس دائري مشقوق | فولاذ مطلي بالزنك (100/عبوة)

Used these to fasten a wooden railing bracket to a steel post and they threaded perfectly without stripping. The zinc coating seems solid and should hold up fine in my garage. Exactly the right length for the job.

These are exactly the right length for securing my deck railing posts, and the 5-1/2" size saves me from stacking washers like I used to. The slotted heads bite the screwdriver well, no stripping even when I really cranked them down.

Ordered these for a small metal shelf project and the 5.5-inch length was exactly what I needed. The slotted drive works fine with a standard screwdriver, though a Phillips would have been more convenient.