I just finished studding my tires for when I hit a ice patch on an out sloped road. Spring time is when it's the worst for ice , but hopefully I'm set. These are screw in studs and a electric drill works great for installing them. I don't know know yet how well they will stay in, but I will keep you posted especially if they start coming out. I bought 200 studs on e-bay for $50 and socket to screw them in with for $4.95
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