6704 Bearing ID: 20mm / OD: 27mm / Width: 4mm
6804 Bearing ID: 20mm / OD: 32mm / Width: 7mm
6904 Bearing ID: 20mm / OD: 37mm / Width: 9mm
Insert the extractor into the bearing, tighten one side with an Allen key, and the collet expands to grip the inside of the bearing.Tap the extractor out with a punch