Specification: M5X10 — 15PCS/M5X16 — 15PCS/M5X20 — 15PCS/M5X25 — 15PCS/M5X30 — 15PCS, total: (75PCS) with 75PCS nut, material: 304 stainless steel (Product measurement in millimeters, 1mm=0.0393701 inches) Good thread: deep lines, even lines, clear lines, balanced use and good fixation. The tail is smooth, easy to use and does not slip. Robust 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