[MATERIAL] Our black ball bearing door hinges are made of stainless steel material, suitable for extreme weather conditions. [SIZE] Our black ball bearing door hinge is 4 inches (100mm) with a 4-inch (100mm) square corner, compatible with various types of doors in residential settings. [FINISH] Matte black finish resists fingerprints and provides a sleek appearance. With excellent surface treatment, these black door hinges offer corrosion resistance, moisture resistance, and aging resistance, making them ideal for warehouse doors, kitchen doors, or outdoor applications. Our products provide a long service life under normal conditions. [BALL BEARING] Designed for extremely smooth and quiet operation, ideal for commercial or high-traffic doors. Each leaf is 0.118 inch (3mm) thick. ANSI/BHMA A156.1 Grade 1 certified. No squeaking — hinges are manufactured with electroplating coatings for high rust resistance and include damping oil to reduce metal-to-metal friction. Color: Black. Material: Stainless Steel. Size: 10 x 10 cm. Package Contents: 3 x Door Hinges. Only the items listed are included; other products are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.