Swivellink Conveyor Rollers are available in Metric (SLCM) and Imperial (AFC) models. The AFC imperial model has an OD of 1.5" while the SLCM Metric model offers an OD of 40mm. All rollers are 1.5" Wide, stack rollers for wider diameters, such as 3 rollers per shaft for a 4.5" Width Conveyor.