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4-Piece Spool Pin Cap #511113-456.
Spool cap is the piece that attaches to the spool pin, that holds the thread in place and helps the thread properly unwind and not jump around while you're sewing.
Allows second spool of thread for double needle sewing.
Sewing machine spool pin cap is designed for replacement, which fits 1/4 inch pin, and outside diameter is approx. 1 3/4 inches.
Spool Cap for Singer Sewing Machines
Keep your thread flowing flawlessly with this 2-pack of double-sided large spool caps, part #511113-456. Designed to fit snugly on your sewing machine's spool pin, these caps hold large or cross-wound thread spools in place, preventing them from bouncing or spinning unevenly during stitching. The double-sided design provides a secure grip on a range of spool styles, helping ensure consistent tension and minimizing thread breakage, especially during high-speed or long-session sewing.