Replacement needle plate insert.
Part # 30123 same as KM30123
Dimensions: 58.9mm x 11mm
Fits Kenmore sewing machine models: 158.16030, 158.17011, 158.17012, 158.17030, 158.17031, 158.17540, 158.18020, 158.18021, 158.18022, 158.18023, 158.18024, 158.18030, 158.18031, 158.18032, 158.18033, 158.18034, 158.18130, 158.18131, 158.18140, 158.18141, 158.18150