The Rolling Thunder - a universal test of grip strength that started a sport.One of the world's premier tests of grip strength, the Rolling Thunder by IronMind is a training tool of first choice for everyone from armwrestlers to rock climbers and will become one of your favorites as well. Hook it up to a loading pin and clip (not included), for one-hand deadlifts, doing either reps or holds.The thick-handled one-hand deadlift is a 20th century archetypal test of grip strength and the Rolling Thunder Deadlift is now a 21st century grip competition staple worldwide.