Linear Ball Bearing, System of Measurement Metric, Inside Diameter 20 mm, Outside Diameter 32 mm, Self-Alignment Self-Aligning, Overall Length 45 mm, Dynamic Load Capacity 900 lbf, Material Delrin, Series Super Smart, Steady State Speed 3 mm/sec, Maximum Operating Temperature 185 Degrees F, Minimum Operating Temperature 0 Degrees F, Inside Diameter Tolerance + 0.013 mm, Accelerated Speed 150 mm/sec