Specification Brand : TERSMA BulletPoint1 : Item : 50mm Single/Swivel Shackle/Stand_Up Block BulletPoint2 : Swivel shackle can be easily locked in 90° degree or either position with our patented lock head system. BulletPoint3 : Forged shackle and riverts are made of professional marine grade SUS 316 stainless steel,solid and heavy duty,corrosion resistance and durable in saltwater. BulletPoint4 : The block features free-spin bush to reduce friction and increase efficiency for smooth rotation. BulletPoint5 : Cutting edge new UV resistant glass fiber reinforced composite sets perfect balance between weight and strength. Color : Carbon Black Department : unisex-adult ImportDesignation : Imported IncludedComponents : 50mm Single/Swivel Shackle/Stand_Up Block ItemName : 50mm Single/Swivel Shackle/Stand_Up Block ItemPackageDimensions_Height : 11 centimeters ItemPackageDimensions_Length : 9 centimeters ItemPackageDimensions_Width : 19 centimeters ItemTypeKeyword : sailing-hardware Manufacturer : TERSMA MARINE Material : Nylon Composite ModelName : 50mm Single/Swivel Shackle/Stand_Up Block NumberOfItems : 1 PartNumber : XSPAA375i Pattern : Solid ProductDescription : Nylon Composite Crusier Blocks Blocks are typically used for high loads for halyard tubing,main sheet systems,mast foot blocks,mast head blocks and boom vangs. Strong and Efficiency Tersma Marine high performance blocks are emgineered for all purposes.The block features free-spin bush to reduce friction and increase efficiency for smooth rotation.316L stainless steel shackle and high density glass fiber composite sideplates provide lightweight and longer service life. ProductSiteLaunchDate : 2025-03-20T02:17:44.831Z Size : 3/8 SupplierDeclaredDgHzRegulation : unknown SupplierDeclaredHasProductIdentifierExemption : 1 UnspscCode : 24101600