Aggressive tungsten carbide-tipped PosiGrip Screw-In Studs that can be added to any wading boot with at least A 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. A 1/4" hex head screws. Adapter for power drill included. 24 studs per pack. Made in the USA. Screw-in studs with exclusive tungsten-carbide tips 24 studs per package Adapter for power drill included