M2-M6 Aluminum Nylon-Insert Flange Locknuts M3-M8 Nickel Plated Nylon-Insert Flange Locknuts M3-M8 Black Zinc Plated Nylon-Insert Flange Locknuts M3-M8 White Zinc Plated Nylon-Insert Flange Locknuts M6-M10 316 Stainless Steel Nylon-Insert Flange Locknuts M4-M16 304 Stainless Steel Nylon-Insert Flange Locknuts M6-M14 Grade 8 Zinc Plated Nylon-Insert Flange Locknuts