[MATERIAL]Our black ball bearing door hinges are made of Stainless Steel Material, Fit For Any Extremely Weather Condition [SIZE]Our black ball bearing door hinge is 4 Inch (100mm) with 4 Inch (100mm) square corner, which can be suitable for different kinds of doors in our home. [FANTASTIC ] Matte black resists finger marks while offering a classy look.With Perfect treatment, black door hinges possess corrosion resistant,moisture resistant and ageing resistance feature for Warehouse door, kitchen or outside using.Our products offer you a longer life span in normal conditions. [BALL BEARING] Extremely smooth and quiet operation, perfect for any commercial or intensively used door. Also Each leaf is a robust 0.118inch(3mm) thick! ANSI/BHMA A156.1 Grade 1. NO Squeak Ever - Our door hinges are specifically manufactured with Electroplating Coatings. They are highly rust resistant and include the damping oil feature which is built to reduce metal-to-metal friction. Colour:black Material:Stainless steel Size: 10 x 10cm Package Contents: 3 x Door Hinges Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.