... 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 ... 12.7850-901400-16001.2-1.6JX0218.2-10.010.0-12.012.10-12.2050-901400-16001.6-2.0JX0259. ... carbide tire studs, tyre nails :Chemical composition: WC-80%+Co-10% Density: (g/cm3):13.0-13.5Hardbess HRA :>90(>1300HV30 ...