1.studs pin Content: WC, Co Density (g/cm3):10.0-14.0 HAR:>1380 HV30 TRS (N/MM2):1660 Porosity (ISO): Free carbon and graphite phase: Metallurgical: A04B02C02E00 Grain size (um):1.2-2.0 Wear indicators: 71±7.5 Pin color: black 2. studs set Material: Low carbon steel, Aluminum, stainless steel, rubber, Iron surface processing: Zinc plated (no surface cracks, corrosion, and no separation of the zinc coating) Set color: yellow, golden, green, black, bronze