The Grip-It carbide tipped screw is 13mm / 0.512" long, making it the shortest in the Twist™ lineRecommended to add traction to footwear, waders, short lug ATV/UTV tires, motorcycle tires, garden tractor and bicycle tiresThis carbide tip screw can be used in lugs 0.472"Add tire carbide tipped screws for added traction in ice, snow, slippery mud or rocksAdd as many as you need to get a gripExtra coarse thread will keep the screw in place until you are ready to remove itCarbide insertHigh grade carbon steeZinc platedEasy to install and remove with Woody's installation tool and a power drillInstallation Tool included in package!25 pack