MATERIALOur door hinges all partsareIncluding pin are made of stainless steel material.Size: 4 inch x 4 inch; Corners: 5/8 inch Radius.They can bear about 400 pounds. UNIQUE ANTI -THEFT DESIGNWe put the pin and bearing in a closed space to increase security. The thickened blade is adopted, with strong bearing capacity, no deformation, corrosion resistance, oxidation resistance. SILENTOur door hinges come with smooth operating plain bearing hinge, smooth operation without jam or squeak. Much more silent and smoother when you close & open the door. PACKAGR3pcs door hinges and 24pcs stainless steel screws, hexagonal wrench.We also offer One-Year Warranty. Note When the door is open, the security hole must be opened with the hexagonal spanner in the product (otherwise the pin cannot be removed) and then the pin removed with other tools (pliers, screwdriver, hammer, etc.). When the door is closed, the security hole is hidden. It is not possible to remove the pin.