Aggressive tungsten carbide-tipped PosiGrip Screw-In Studs that can be added to any wading boot with at least 1/2" of midsole depth. Sharp tip allows for quick and easy installation into felt or rubber outsoles. A must where maximum traction is needed. 1/4" hex head screw.Features Include:Screw-in studsExclusive tungsten-carbide tips24 studs per packageAdapter for power drill includedMade in the USA.