Vintage original Singer sprung Darning and Embroidery Foot, also known as the Stripper Foot.

This foot replaces the needle clamp, so it makes a great option for free motion sewing with a back clamping model 66. 

Part #86294

Fits Singer models: 15-30, 15-86, 27, 28, 66, 99, 101, 127, 128, 185