●【Dimension】Screw Thread Specification: M6 x 10mm; Cap Nut Thread Specification: M6; Length Under Nut Head : 15mm/0.59"; Nut Head Diameter: 12.8mm/0.5"; Nut Aperture: 8mm/0.31"; Groove Type: 4mm/0.16". ●【Good Quality】Made of quality carbon steel material,spraying treatment,sturdy and anti-rust, easy to bind, install and remove, can use repeatedly, good tightness. ●【Easy to Use】Easily applied with standard screwdriver. Threaded post lets you open and re-attach piece where needed. ●【Instructions】Make a hole larger than 0.5mm than the diameter of the nut rod, put screws and nuts on both sides of the locked object, and select the appropriate tool to lock it. ●【Wide Application】Especially suit for leather handicrafts decoration, bookbinding, document, book, album, DIY crafts, etc.