Specification Brand : Antsky BulletPoint1 : Material:304 Stainless Steel,Black finish; BulletPoint2 : Actual inside size:3.58×3.58inch(91×91mm); BulletPoint3 : This package come with 16 Pcs 5/16" hex screws and 32 Pcs 3/16" screws,all the screws are made of stainless steel and can only apply to wood base; BulletPoint4 : Note: 4x4 wood post’s actual size depends on the wood type and dryness. We made inner diameter 3.5x3.5inch square anchor base according to the genral size of wood. We believe in very rare cases post actual size is larger than 3.5inch. In this case, we can try sanding and triming the wood post, to match with the inner size of the post base.But if we made the post base size over larger than 3.5inch, there will be a gap between wood post and the base, which is difficult to fix. BulletPoint5 : 20 series aluminum extrusion profile end need tapping M6 x 10mm,pitch M6 x 1.0 , to make it possible to connect pivot joints to other parts, such as another profile or keyboard extension arm, etc Color : Black CustomerPackageType : Standard Packaging DriveSystem : External Hex ExteriorFinish : Stainless Steel ExternallyAssignedProductIdentifier1 : 733277871225 ExternallyAssignedProductIdentifier2 : 0733277871225 ExternallyAssignedProductIdentifier3 : 0707392248705 ExternallyAssignedProductIdentifier4 : 0795871098774 ExternallyAssignedProductIdentifier5 : 00707392248705 FinishType : Painted GpsrSafetyAttestation : 1 GradeRating : Premium IncludedComponents : Hardware,Fasteners & Hooks,hardware-brackets ItemDepth : 0.7874 inches ItemDisplayDimensions_Height : 28 inches ItemDisplayDimensions_Length : 28 inches ItemDisplayDimensions_Width : 3.82 inches ItemName : Antsky 4×4"(Actual:3.5×3.5inch) Post Stainless Steel Flange Anchor Base with Screws for Deck Railing, Black Finish (4 Pack) ItemPackageDimensions_Height : 31.496 centimeters ItemPackageDimensions_Length : 16.6878 centimeters ItemPackageDimensions_Width : 24.1046 centimeters ItemPackageQuantity : 4 ItemShape : Rectangular ItemTypeKeyword : hardware-brackets Manufacturer : CHUGE Material : Stainless Steel MaximumShearStrength : 300 MPa MeasurementSystem : Imperial MetalType : Stainless Steel ModelName : Flange Anchor Base ModelNumber : FAB01 MountingType : Corner Mount NumberOfItems : 1 NumberOfPieces : 48 PackageLevel : unit PartNumber : TL-20HD-K ProductDescription : This square post anchor can be used for wooden post of deck railing、 fence、handrail railing、deck、 Pergola、Pavilion、Log cabin and so on. ProductSiteLaunchDate : 2021-05-27T08:12:28.155Z Size : 4×4"(Actual:3.5×3.5inch) Style : 4Pcs Pivot Joint with Bolt Nut SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 4 UnspscCode : 31161500