DetailsAggressive tungsten carbide-tipped PosiGrip Screw-In Studs that can be added to any wading boot with at least 1/2" of mid-sole depth. Sharp tip allows for quick and easy installation into felt or rubber out-soles. A must where maximum traction is needed. 1/4" hex head screws. Adapter for power drill included. 24 studs per pack.