• BEF1/4-20-501 Classic Line | BEF1/420501ClassicLine• Inner dimension: 6,35, Outer dimension: 19,05, Width: 9,5, Weight: 0,027, Thread type: Female thread, Thread direction: Right-hand thread, Seal: None, open bearing, Lubrication hole: Without lubrication groove, Maintenance: Maintenance-free version