A popular foot with patch workers for that essential 1/4 inch seam. The guide on the foot enables you to sew a perfect 1/4 inch seam every time. The guide can also be used wherever a 1/4 inch seam is called for but the markings on the needle plate cannot be used, such as when completing a flat seam. Guaranteed to fit Baby Lock Sewing Machine Models: BLQ2-PL Quest Plus, BLSN Serenade. Guaranteed to fit Singer Sewing Machine Models: Quantum L-500.