Linear Ball Bearing, System of Measurement Metric, Inside Diameter 12 mm, Outside Diameter 22 mm, Self-Alignment Self-Aligning, Overall Length 32 mm, Dynamic Load Capacity 79 lbf, Material Delrin/Steel, Series MultiTrac, Steady State Speed 3 mm/sec, Maximum Operating Temperature 185 Degrees F, Minimum Operating Temperature 0 Degrees F, Inside Diameter Tolerance + 0.011 mm, Accelerated Speed 150 mm/sec