BOXOB 8pcs Thumb Fin Screws for Surfboard, 316 Stainless Steel Longboard Top Fin Screw and Plate with O Rings, Surfing Part Replacement Accessories for Surf Board and Inflatable SUP Paddle Paddleboard

["Packing List: You will receive some sup fin screws and some o rings in the package, sufficient quantity to meet your daily uses and needs.","Sturdy Material: Our sup fin screws are made of great quality 316 stainless steel, making them sturdy, durable, long-lasting use, not easy to break, deform or damage. You can buy them with confidence.","Size Details: The total length is about 22mm/0.87in, and the square gasket is 14x14mm/0.55x0.55in, thickness is 3.8mm/0.15in. Please check the size carefully before your buying.","Compatibility: These fin screws are perfect for longboards, surfboards, SUPs, single fins, paddle boards, and most standard surfboards.","Easy to Install: Only a screwdriver (not included) is required to tighten, no additional tool required."]