Toledo stainless steel ball bearing hinges are a reliable choice for heavy-duty door hardware. These hinges are typically used in commercial settings where doors undergo frequent use and require sturdy support. The dimensions 4x3.5"x2.5mm indicate the height, width, and thickness of the hinge, ensuring a robust fit for doors. Stainless steel provides durability and resistance to corrosion, making these hinges suitable for various environments, including those with high moisture.