Rugged construction for years of use. Strong magnet for attaching to any applicable metal surface. Provides a versatile solution for the problem of finding a good ground. Sharp adjustable depth contact tip penetrates corrosion or metal coatings for a good connection . Limited lifetime warranty The Universal Magnetic Ground Lug eliminates searching for an area to clip test equipment ground leads. The strong magnet attaches to any applicable metal surface and can provide a perfect place to clip test leads. The Sharp adjustable depth contact tip penetrates corrosion or metal coatings for a good connection.