Our HardBite Wading Boot Studs - For VibramA(R) Soles (180 Count) easily convert our StreamTread(TM) soles to studded. 45+ Rockwell hard screw, zinc-plated for corrosion resistance Welded carbide gripper pellets enhance traction & durability 1/4" hex head sharp point screw can be installed with any A 1/4" hex nut driver or driver bit