***Hello! Welcome to our store! *** Quality is the first with the best service. customers all are our friends. Welcome to buy! Material: Copper Size: d(thread diameter) x L(thread length) Metric thread diameter: M2 (2mm)/M2.5 (2.5mm)/M2.6(2.6mm)/M3 (3mm)/M4 (4mm) Thread length: 3mm-10mm Metric thread pitch: 0.35mm(M1.6) /0.4mm(M2)/0.45mm(M2.5)/0.5mm(M3)/0.6mm(M3.5) 0.7mm(M4)/0.8mm(M5)/1mm(M6)/1.25mm(M8) Price is for Only 1 bolt