Dodge Pillow Block Roller Bearing Unit, Double-Interlock Type K, Series: 307, 3-7/16 in Bore Dia, 12.81 to 13.81 in Bolt Center-to-Center Length, 4-1/2 in Base to Bore Centerline, 16 in Overall Length, 4.27 in Overall Width, 9.42 in Overall Height, Two-Bolt Base Mount, Round Bore Type, 3.44 in Base Width, 65 deg Setscrew Locking Device, Trident Triple-Lip Seal, Expansion Expansion Type, 17750 lb Dynamic/108600 lb Static, 1640 rpm Maximum, Cast Iron, Black Oxide Factory assembled, adjusted and prelubricatedCase hardened rollers and racesEasy installation and maintenanceTriple rubber lip contacting seals