About this item High-Quality Material: Chain Link Fence Posts Floor Flange are made of QT450-10 ductile cast iron cast in one piece, With galvanized baking paint on the surface, Which is Waterproof and Rust-Proof, Sturdy and Durable. The caliber and bottom of the post anchor bracket are CNC precision turned to make the pipe diameter more precise; The bottom fits better with the concrete foundation to prevent shaking and tipping. Wide Application: Post Base Flange is widely used in Chain Link Fence Posts, Lamp posts, Mailboxes and other steel cylindricity bases. Standard Size: For 2 1/2″ pipe (Actual: 2 3/8″ OD), L/6.5″ x W/6.5″ x H/4.35″, Qty: 6pack. Easy Installation: Drill a hole of 5″ depth (Drill Bit: Φ5/8″ – Not included) in the concrete foundation with an electric hammer; Place the base flange in the mounting position, Tap the expansion screws into the holes and lock them in turn; Then slide the strut in to screw the hexagonal screws into the flange sides (L: Φ3/8″ x 3/4″) to lock them in place, And the installation is complete. Set Includes: 6pc Floor Flange, 24pc Expansion Bolts (Φ9/16″x4.72″), 12pc Side Hex Fixing Screws (Φ3/8″x3/4″); We endeavor to provide our customers with high quality products, If you have any questions about our products, Please feel free to contact us.