Shop Hammerhead™ Aluminum Flood Barrier Parts and Accessories › Hammerhead™ Plank Tensioning Bolt (Set of 5) Image 1 of 3 Image 2 of 3 Image 3 of 3 Hammerhead™ Plank Tensioning Bolt (Set of 5) $5.25 Hammerhead™ Plank Tensioning Bolt, 316L Stainless Steel. Sold in sets of 5. Add To Cart Added! Hammerhead™ Plank Tensioning Bolt, 316L Stainless Steel. Sold in sets of 5.