Die Set Plain Linear Bearing - Aluminum Shell PACMZ50 50mm ISO MetricDie set plain linear bearing with a 50mm ISO Metric ID (inner diameter), a precision running clearance of 0. 0005 per side and a closed aluminum shell. Features a round flange and self lubricating FrelonGOLD liner as standard, which provides optimal performance in extreme conditions such as dirt, heat and vibration. An optional FrelonJ liner is available for harsh chemical environments (use stainless steel shafts for this) and FrelonW is offered as an