Our door hinges all partsareIncluding pin are made of stainless steel material.Size: 4 inchx4 inch; Corners: 5/8 inch Radius.They can bear about 400 pounds. We 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. The hinges use ball bearings inside. Much more silent and smoother when you close & open.Matte black finish resists finger marks. 3pcs matte black door hinges and 24pcs stainless steel screws, hexagonal wrench. NOTEIf you are replacing your old hinges, please make sure the screws hole are with the same style! 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.