One piece zipper foot (narrow). 

• High shank, Center needle position, Hole in center.
• Part # 40322

Fits Singer models: 191D, 195K, 196K, 241, 245, 251, 281, 31 Class, 331K, 366K, 400W, 44, 451K, 491, 591D, 600W, 660A, 770, 771, 95, 96 

Also works with many Brother, Consew, Juki, Rex, Tacsew and single needle lockstitch machines.