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By certification 
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
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
