GP Industries 5-100lb Dumbbells Pro Style

Dumbells are used and do have some peeling or chipping from use. Most does show on the higher dumbbells like the 100's and 75's (see pics) GP Dumbbell Features: Commercial dumbbells by GP Industries, aka American Barbell, offers an exclusive locking design used to permanently attach the solid steel urethane coated heads to each solid steel “Unilock” dumbbell handle. A traditional bolt-together dumbbell, such as a Pro-Style dumbbell, uses an internally threaded dumbbell handle shaft that accepts a 5/8” fine thread Allen bolt to lock the multiple cast iron plates and handles together as one. While the Pro-Style dumbbell is a very strong dumbbell design used in commercial gyms, it is hamstrung by this Allen bolt that can often loosen when the dumbbells are dropped even with the use of a professional thread locker such as Loctite. To solve this age old problem, designers at GP Industries reverse engineered the Pro-Style dumbbell threading the dumbbell handle shaft itself with a course th