151x1 151x5 = Merrow 60M, ALSO = 1D, 2D, 3D, 4D, 5D.... For All Industrial Merrow Pearlstitch sewing machine and Singer Class: 246, 246K, 460K, 151x7, 151x5, 60M, 60 MSD, MY 1151, TLx7, MRxR9