Qualfast: M4 Tooth Flange Hex Nut A A2 A2 Stainless Steel Manufactured from stainless steel to prevent rusting. MPN: M4 Tooth Flange Hex Nut A A2 Attributes: Box Quantity: 500 Driving Features: Hexagon Material: A2 Stainless Surface Treatment: Plain Thread: Metric Thread Direction: Right Thread Size: M4