Fastening systems (you know…screws) are not included with our dock bumpers since everyone has a different setup. To determine how many screws, bolts, washers or zip ties you'll need: There are 14 grommets (seven on top and seven on the bottom) per 9-foot dock bumper. There are 10 grommets (five on top and five on the bottom) on each 4.5-foot dock bumper.
For a wood or composite deck, we recommend #14 x 1.5-inch or #14 x 2-inch stainless steel screws.
For concrete, we recommend a ¼-inch or 2-inch wedge bolt.
We also recommend ½-inch stainless steel washers on all applications.