Specifications: 1. Head diameter 2.1mm-9mm 2. Shank diameter 1.5mm-6.5mm 3. Contact face material AgCdO, AgNi, AgSnO2 4. Thickness of contact face material 0.2mm-0.5mm 5. Thickness of shank face material 0.5mm-0.8mm 6. Contact material: AgCdO, AgSnO2, Agni Inner Package: vacuum plastic bag Outside Package: carton