We will gladly offer you a checklist of references you might contact and also we have Comments available on our web site. A favorable referral is among the most effective methods to find a great contractor. The image shown is of a 5/8" galvanized screw being used to affix a structure board to a piling. This dock is only 5 years old, the damage is the result of making use of unsuitable screw material and will substantially reduce the life of the dock.