Blue Wave 18-ft x 36-ft Rectangular In Ground Pool Safety Cover - Green Drill and Tamp style brass anchoring system permanently secures anchors in concrete Multi-seamed stitching ensures safety and prevents wear and tear Stainless Steel hardware resists damage from the elements High scrim mesh panel design lets water though but protects pool against dirt and debris Reinforced wear strips on underside of cover to guard against cover abrasion and fraying