Hex head, female threaded inside, metric M2 nuts, 304 stainless steel material, DIN 934.Used widely compatible with matching screws or bolts.Product Name : Hex NutFemale Thread Size : M2HexSize : 4mm/ 0.16inch Thickness(Approx) : 1.5mm/ 0.06inch Material : 304 Stainless SteelColor : Silver ToneNet Weight : 13gPackage Content : 100pcs x Hex NutNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.