Review on Marrkey 12mm Carbide Screw Tire Studs for Enhanced Traction on Snow/Ice - Anti-Slip Spikes for Car/Snowmobile/Tractor/ATV/UTV/Motorcycle/Short Lug/Bicycles/Shoes with Easy Installation Tool - Pack of 100 by Darius Newberry

Waste of money! Although the screws appear to be good, you cannot install them without the installation tool. It's ON BUT NOT WORKING. It's too big for screws. Instead of sliding smoothly in the tires, they spin in a furious circle at the end of the drill, scraping the pieces of rubber but not penetrating them at all. Due to the design of the screw head, it's almost impossible to find anything that works with these screws outside of the provided junk. I 100% regret buying these spikes.