200Pcs Solid Brass M2.5x3 3.5OD Embedded Knurled Nut Knurled Thumb Nuts Product: Embedded Knurled Nut; Surface: straight lines; Dimension: M2.5x3; Outer Dia: 3.5mm Material: copper; Standard: GB; Color: as picture shows; Package Content: 200 x Screw Nut;