This ST20 bearing is a Cast Iron Take Up Bearing Unit. The bearing's dimensions are 20mm Shaft Diameter. ST20 1020-20G2 Self Lube Cast Iron Take-up Bearing Unit   Set Screw Lock - Long Inner Ring Bearing Insert Casting Group

This ST20LS bearing is a Cast Iron Take Up Bearing Unit with a larger than normal unit for the basic bore size. The bearing's dimensions are 20mm Shaft Diameter. ST20LS1020-20G2 Self Lube Cast Iron Take-up Bearing Unit   larger than normal unit...