Double Plain Linear Bearing DFPM50 50mm ID Square Flange End, Precision ClearanceExtended Plain Linear Bearing with a 50mm ID consisting of a square flanged aluminum housing (end mount) with a precision ID running clearance and a self lubricating FrelonGold lining for maintenance free linear, rotational or oscillating motion in harsh conditions like extreme heat, dirt, and vibration. Extended Size Housing with Linear Bearing Inside Square Flanged End Mount Closed Shell Precision ID running clearance (0. 0005" per side) Self