D8 – 30 pcs | d10 – 15 pcs. d5 – 40 pcs | d6 – 40 pcs. d3 – 50 pcs | d4 – 50 pcs. Stop rattles, close thread play and keep preload steady without adding height. Only 0.2-0.5 mm thick, the curved profile fits inside counter-bores, shallow PCB bosses or hinge recesses where thicker springs simply won’t sit.