... )Factory-Quality Control: ISO9001:2000Size: 1.5''/2''/2.5''/3''/3.5''/4''/4.5''/5''/6''/8'' (made by any ... double (made by any customers' requirements)Characteristics of Best seller ball bearing door hinge: 1, High quality material: stainless steel and the ... the high-level resistance oil, protects the bearing, creates a durability of three years. 3, The axial play are small, is 0 ...