M3 M4 M5 M6 M8 M10 M12 304 Stainless Steel Square Nut Quadrangle Nut Thick / Thin Nut DIN557 Lock The Thin Screw Cap 5~50pcsHome Improvement > Hardware2,90 USD (≈ 11,43 zł)6,45 USDDostępnySold by AliExpress WWDo sklepu