Both have a magnification of 3x in the center and include an adhesive ring that will prevent the Spot on Dot from slipping or shifting while you make cuts
Singer 6211 Sewing Machine Service Manual
care should be taken to keep the thread clear from obstructions or moving parts
Singer 9920 Instruction Manual (Model 9920) - 84 Pages
Guaranteed to fit BabyLock Sewing Machine Models:
Hemmer Foot Set, Low Shank, Singer #P60287 discountable Both have a magnification ofGuaranteed to fit Singer sewing machine models: 1280, 1802, 221 Featherweight, 237 Fashion Mate, 2404, 3101, 360 Fashion Mate, 4411 Heavy Duty, 5050, 533 Stylist, 5502, 5802, 5825, 6102, 9910, FM17 Fashion Mate