Linear Ball Bearing EP50G-AJ 50mm AdjustableAdjustable Linear Ball Bearing with a 50mm ISO Metric ID (inner diameter). This adjustable round shaft bushing would be used when working with an old shaft or an old machine, or any other environment where parts are not perfectly made. Temperature Range: 4 +176F ( 20 +80C) Variant ID Sizes: Available from 1 4" to 2 Inch Series, 8mm to 50mm Metric Interchangeable: Size interchangeable with industry standards and our Simplicity plain linear bearing