Suitable for 4423, 4432, 4452, 5511, 5523, 5532 Heavy Duty, 5554, 6510, 6550, 7312, 7322, 7350, 7360, 7380, 8260L, 8275, 8280, 8770, 9100, 9340, 992DE, H74 auxiliaries replacement spool cap and spool pin allows you to quickly replace or upgrade on your sewing machine Crafted from, these sewing machine parts are designed to withstand regular use while maintaining their functionality and appearance over time The spool cap for sewing machines is designed to securely hold thread spools in place, it from slipping or tangling during sewing A spool cap is the piece that attaches to the spool pin, that holds the thread in place and helps the thread properly unwinds and not jump around while you ' re sewing