Specification Brand : Sturdy Built BulletPoint1 : The Included U Bolts fit around a 3 inch wide by 3 inch tall cross member. The U Bolts measure 1/2" in diameter, 3" wide, by 4 5/16" long. BulletPoint2 : This Swivel Top style bunk bracket is the industry standard 12" height with slotted holes for multiple height adjustments BulletPoint3 : The Adjustable Swivel Top Brackets in this kit are larger than your typical swivel top brackets in order to match the Heavy Duty Brackets that they mount to. However these tops still swivel just the same, allowing you to contour your bunk boards perfectly to the shape of your boats hull; whether angled or flat. BulletPoint4 : Easy Installation: The 35.43" long bracket is designed for easy installation on a boat trailer. It securely supports the keel of the boat, ensuring a secure and stable transportation for your boat. BulletPoint5 : Package Details: The package includes one boat trailer bottom support bracket with keel rollers. The product dimensions are 35.43" in length, 2.80" in width, and 6.69" in height, and it weighs 12lbs. The package size is 36.20" in length, 1" in width, and 7.9" in height, and it weighs 14.30lbs. Color : Silver Department : unisex-adult ExternallyAssignedProductIdentifier : 00810132346651 FitType : Universal GpsrSafetyAttestation : 1 ImportDesignation : Imported IncludedComponents : Boat Trailer Bottom Support Bracket ItemDepth : 12 inches ItemName : Sturdy Built (2) 12" Galvanized Double U Bolt Swivel Top Bunk Bracket Kit for 3x3 Boat Trailer Crossmember ItemPackageDimensions_Height : 9 centimeters ItemPackageDimensions_Length : 20 centimeters ItemPackageDimensions_Width : 12 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : boat-trailer-guides-and-rollers Manufacturer : Sturdy Built Material : Zinc Plated ModelName : Boat Trailer Bottom Support Bracket ModelNumber : 20bbe972-1d07-4e91-9bb7-f33f60dd6f36 MountingType : Wall Mount NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : 25826-2 Pattern : Solid ProductDescription : When looking for the best, get something Sturdy Built. Ideal for saltwater or freshwater use, this galvanized kit contains everything you need to mount your bunk boards (not included). These bunk brackets mount with the flat surface facing your boat trailers cross braces. The galvanized u bolts wrap around the brace, and the washers and nut secure the bracket in place. The slotted holes in the bunk support allow for height adjustment. Includes: swivel top brackets, slotted bunk brackets, zinc plated bunk bracket bolts, galvanized mounting U-bolts for the brackets and galvanized lag screws to secure boat trailer bunk boardsWhen looking for the best, get something Sturdy Built. Ideal for saltwater or freshwater use, this galvanized kit contains everything you need to mount your bunk boards (not included). These bunk brackets mount with the flat surface facing your boat trailers cross braces. The galvanized u bolts wrap around the brace, and the washers and nut secure the bracket in place. The slotted holes in the bunk support allow for height adjustment. Includes: swivel top brackets, slotted bunk brackets, zinc plated bunk bracket bolts, galvanized mounting U-bolts for the brackets and galvanized lag screws to secure boat trailer bunk boards. ProductSiteLaunchDate : 2019-02-15T13:56:38.568Z Size : 8inch Style : 4 Pack SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 UnitCount : 2 UnspscCode : 31161500 WarrantyDescription : 1