This upper knife is a genuine replacement blade designed for Baby Lock serger machines. Over time, serger knives can dull or nick, leading to ragged fabric edges instead of clean trims. Swapping in a fresh upper knife restores your machine’s cutting performance and helps protect your fabric and finished seams. A smart maintenance staple to keep on hand for any Baby Lock serger owner.

• Restores clean, accurate cutting on Baby Lock sergers
• Helps prevent ragged or frayed seam edges
• A practical spare to have ready when your current blade wears down