100 pcs Nylon Lock Nuts:50 x M2.5 Nylon Lock Nuts & 50 x M2 Nylon Lock Nuts1.Hex head, female threaded inside, metal material, anti-loose hex nut.2.Used with a machine or cap screw for mechanically joining materials together.3.Used widely for matching screws or bolts.Thread Size: (Female)M2.5 & (Female)M2Height: 3.5mm/0.14inch; Pitch: 0.45mm+3mm/0.12 inchWidth Across Flats: 5mm/0.2inch + 4mm/0.16 inchWidth Across Corners: 5.4mm/0.21inch + 4.3mm/0.17 inchProduct Name:Nylon Lock NutsMaterial:Zinc PlatedMain Color:black & silverMade of metal material, full threaded rod.The most economical and most common form of Threaded Rod.Typically used by the plumbing and contracting trades. Used in maintenance departments in various applications.Package Content:100 x Nylon Lock NutsOnly the above package content, other products are not included.Note: Light 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.