Holiday Ice Racing Studs / ScrewsHoliday ice racing screws are used to make ice racing tires for quads and dirt bikes. Many people also use the shorter 1 2" screws threaded into the lugs of various off road tires for increased traction. A very good alternative to chains for plowing snow in icy conditions. 1 2 5 8 Length come in boxes of 1000 3 4 1 1 2 Length come in boxes of 500 Custom designed hex head has more biting edges than other screws Heat treated Approved for all types of