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• WN Sizes 7201K Through 7203WN Have A 20° Contact Angle And A Nylon Cage. Sizes 7204WN through 7218WN have a 40° Contact Angle And A One-Piece, Ball Piloted, Pressed Brass Cage. Larger Sizes 7219WN Through 7230WN Have A 40° Contact Angle And A One-Piece, Outer Ring Piloted High-Strength Machined Bronze Cage. Ball Bearing, Angular Contact, Super Precision, Low Shoulder On Both Rings