1/4" x 3", Zinc plated steel, External hex

Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.

Flange bolts have a flange on the bottom of the head that distributes the load like a washer.

Large wood screws technically called lag screws.

Fasteners for anchoring in stone, concrete, brick and drywall, etc.