The HEXAGRIP(TM) Alloy Cleat & Carbide Stud Pack contains everything you need to fully cleat and stud a pair of Grunde;ns Vibram(TM) wading outsoles. We designed our outsoles to accept both Hexagrip(TM) 19mm alloy cleats and A 1/4" Hexagrip(TM) carbide screw-in studs in an under-foot pattern that optimizes in-river traction and durability while maintaining Vibram(TM) rubber contact in critical traction zones.