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 fine 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 4 x 9mm , 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 Screws Colour:silver Material:Metal Package Contents: 100 * Tire Stud Screws Only 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.