M1 M1.2 M1.4 M1.6 M2 M2.5 M2.6 ~ M64. Assembly and maintenance of food processing machinery, as its material is safe and does not contaminate food. HEXAGON HEX FULL NUTS A2/A4 STAINLESS STEEL. Material choose: Stainless steel A2 304 / Stainless steel A4 316.
eBay