Reliable and sturdy: the wheel tire snow studs are made of carbon steel, aluminum and hard alloy, which are sturdy and reliable, durable and firm, with nice strength and fine craftsmanship, not easy to break, rust or corrode, so as to serve for a long time Size details: the snow tire spike trims measure about 4 x 9 mm, 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 and the ground, so as to improve the stability of the vehicle in operation, 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 slipping and falling easily Easy and 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 with the metal sleeve, then drill