... tire studs 2. flat tyre studs 3.size:9-10,9-11,9-12,9-13,9-14all the specifications can be used in cars ... . Length(H)10 +/-0.15 mm,11mm,12mm,13mm,14mmHead Diameter(D)9 ... .2050-901400-16001.6-2.0JX0259.0-11.010.2-11.212.77-12.8787-971380-14801.6- ... composition: WC-80%+Co-10% Density: (g/cm3):13.0-13.5Hardbess HRA :>90(>1300HV30)TRS Mpa:(N/MM2):1660Poposity ...