Dodge Ball Bearing Unit, Medium Duty Non-Expansion, Series: 210 Series, 1-3/4 in Bore Dia, 7-1/4 in Bolt Center-to-Center Length, Two-Bolt Base Flange Mounting Type, 8.63 in Overall Length/Diameter, 2.3 in Overall Depth, 5-1/4 in Overall Height, D-LOK Concentric Clamp Collar Locking Device, Steel Bearing, Nitrile Rubber Seal, 7891 lb Dynamic/5213 lb Static, 4500 rpm Maximum, Powder Coated Precision hardened and honed inner and outer ringsNew rugged housing designWide inner ring designDualGuard positive contact seal including rubberized flingersStronger and flexible ball retainerSimplified anti-rotation devicePremium triple lip QuadGuard sealFast and easy installation