Simms HardBite Vibram Soles Boot Studs are studs designed to convert StreamTread soles into studded boots. The HardBite Vibram Sole Boot Studs from Simms Fishing convert the regular StreaTread models of boots into studded models offering more traction. The construction of the Hardbite Boot Studs focuses on durability and traction incorporating welded carbide gripper pellets. The screws are 1/4" hex head shape and easily attach with the included hex nut driver. The HardBite Vibram Sole Boot Studs can be used individually or in combination with Hardbite Star Cleats in any pattern the angler chooses. Each pack contains 20 studs and a hex nut driver tool.