INS - Dome Carbide tipped stud, 15mm long HEX head (.50" Thread ) Gripmasters are built to provide positive traction for vehicles in icy or rocky conditions where the terrain is uneven or rough. The heads protrude 5/16” above the rubber for a deep positive grip to enable the operator to be able to do his job quickly and efficiently without spinning or side-slipping. Gripmasters are the best traction for skidsteers and are more effective than any other traction aid – especially chains. They are the only way to improve traction on tracked vehicles and they’re better than chains on wheeled vehicles like loaders, graders, backhoes, etc. They’re available in 3 lengths, but, unless the tread is very badly worn, the 1” length is recommended. Solid carbide head for best bite and longest wear Self-tapping threads need no drilling and won’t pull out Better than chains to prevent side-slipping, less damage to tires Heat-treated alloy steel body Recommended installation 2-4 studs per lug