Shop Hammerhead™ Aluminum Flood Barrier Parts and Accessories › Hammerhead™ Tensioning Bolt For Posts and Planks Image 1 of 5 Image 2 of 5 Image 3 of 5 Image 4 of 5 Image 5 of 5 Hammerhead™ Tensioning Bolt For Posts and Planks $22.00 Hammerhead™ Plank Tensioning Bolt, 316L Stainless Steel. Sold in sets of 5. Quantity: Add To Cart Added! Hammerhead™ Plank Tensioning Bolt, 316L Stainless Steel. Sold in sets of 5.