Specification Binding : Unknown Binding Brand : Bonbo Label : Bonbo Manufacturer : Bonbo MaterialType : Material,Steel Model : ID 1" x OD 2" 4pcs NumberOfItems : 4 PackageDimensions_Weight : 1.1243575362 PackageDimensions : L:3.7007873978 X W:2.6377952729 X H:2.5984251942 PartNumber : ID 1" x OD 2" 4pcs ProductGroup : BISS Basic ProductTypeName : HARDWARE_BEARING Publisher : Bonbo SmallImage_Height : 75 SmallImage_URL : https://m.media-amazon.com/images/I/41L4WiwFlLL._SL75_.jpg SmallImage_Width : 75 Studio : Bonbo Title : Bonbo 4Pcs Garage Door Torsion Spring Center Bearings ID 1" x OD 2" Deep Groove Ball Bearing Weight : 1.1 WeightUnit : pounds