Reliable and sturdy: the wheel tyre snow studs are made of carbon steel, aluminum and hard alloy, which are sturdy and reliable, tough and firm, with nice strength and craftsmanship, not easy to break, rust or corrode, so as to serve you for a long time.Size details: the snow tire spikes trims measure about 12 mm/ 0.47 inch in length and 4 mm/ 0.16 inch in diameter, and the tip diameter is approx. 2.3 mm/ 0.09 inch, the compact size is very suitable for bicycle, boot, motorcycle and more; Please check the dimension details carefully before placing an order.Practical function: the screw in tire studs can increase the friction between the tire surface and the ground, so as to improve the stability of the vehicle in the process of running, very suitable for driving or riding on snowy days, and the small size is also applicable for snow boots, allowing you to go climbing, hiking, camping without sliding and falling easily.Easy and quick to install: the hard alloy tire stud screws are very easy to install with the included installation tool, just simply put the screw on the drill machine with the metal sleeve, and then drill the screw into the tire, convenient and time-saving.Type:Tire Stud ScrewsItem Size: 4x12 mm(per)Durable Vehicles Off-Road Wheel Tyres 12mm Tire Snow Chains Spikes StudsThe new style screw in tire studs can be easily installed and removed without toolsIt can also be disassembled according to the reason, When not in use, it could be removed lightly and stored for using again in followingseason.Choose appropriate size of new studs in the installation process in terms of the depth of tire threadEasy to install and remove - less than 1 hour with simple hand toolsEconomic - add off-road capability to your"normal" ATV,UTV or Colour: silverMaterial: metalPackage Contents:100 * Tire Stud ScrewsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.