Measurements Inner Diameter: 12 Outer Diameter: 18 Thickness: 16 Measurement Unit: Metric Materials Bearing Type: One Way Bearing Product Seal: No Seal (N) Ball Material: Chrome Steel Retainer Material: Metal or High Speed Plastic Technical Specifications Quantity: 1 Condition: New Inventory From Factory. Quality Level ABEC 3 or Better Operating Temperature: Sealed or Metal Shields Ranges: –20 °F to +230°F [–30 °C to +110°C]. The determining factor will be the lube and the seal material. Raceways: Finely polished superior finish for long life, and low noise. Lubrication Wide temperature range (-50F to + 300F) High Quality Synthetic Lubricant.