Specifications: M5X10 — 15PCS/M5X16 — 15PCS/M5X20 — 15PCS/M5X25 — 15PCS/M5X30 — 15PCS, total: (75PCS) with 75PCS nut, material: 304 stainless steel( Product measurement in millimeters, 1 mm = 0.0393701 inch) on thread: deep lines, even lines, clear lines, balanced use and good fixing. The tail is smooth, easy to use and does not slip. Sturdy and reliable. Product Features: The main function of the external thread of the hexagon socket bolt is to match the nut. Use this threaded connection to combine the two parts. 304 stainless steel, high hardness, corrosion resistance, can be used in humid environments and do not worry about rusting