Screw length (including the neck): 2-1/2 inch or 63mm.
Material: 304 stainless steel (A2) and no exterior finish, greater strength and corrosion resistance performance than regular stianless steel or zinc plated fasteners..
Carriage bolts have a dome shaped head and a square neck generally requiring a hex nut and flat washer. The square neck makes them self-locking when used within a square hole..