The rubber grip adds comfort & efficiency while working out. The solid steel handle with a black oxide finish offers a sleek, durable dumbbell handle that will last for years to come. This bar accommodates standard weights with a 1-inch center hole. Use to engage upper body muscles including chest, back, biceps, triceps, traps, and your core. This dumbbell handle was designed to handle heavy weight safely & securely with coatings applied that last through the most grueling workouts. s Standard 14" Threaded Dumbbell Handle includes 2-star lock collars to the weights are secured while performing exercises.