Simms HardBite Vibram Sole Wading Boot Studs - Easily convert StreamTread soles to studded with these studs. Made for Vibram soles 45+ Rockwell hard screw, zinc-plated for corrosion resistance Welded carbide gripper pellets enhance traction and durability 0.25in hex head sharp point screw can be installed with any 0.25in hex nut driver or driver bit 180 studs per package Style: AHB109BULK