This part is compatible with Husqvarna Viking machines in groups 5, 6, 7, 02, also fits 01 except *5610 and *5710. "Please double check that you are selecting this walking foot for (01) and NOT the (1). For the (1) select #4122804-01. "Not for Bernina Conversion." 4123572-01 (BR). There is no difference in the function from the Viking original. Quilters sew bulky layers of fabric and batting smoothly and easily. Helps keep plaids and stripes even. Comes with guide (different than picture) for precise top stitching which adjusts left or right. On some models it may be necessary to slightly adjust the needle position to the opening in the foot. On the older models Viking (A)(B) HuskyStar series, (01) 2000, 3000, 6000 series we recomend you also order the Needle Clamp Attachment Screw #54635 "A" listed above. Special note: Screw #54365 "A" is not for newer models which takes Viking Attachment/Needle Clamp Screw #4125825-01