The Best Grip 3000A tungsten head stud. The most prominent tipped stud in the wader screw range. It will cope with all terrains where traction is essential. Fit between deepest tread patterns or target the ankle zone of the boot soles for maximum penetration The 4.5 mm tip will make contact with the ground beneath your sole but not detract from the grip pattern on your boot. The stud requires a custom adapter to fit.