Complete Adjustable Dumbbell Set: Includes two 16-inch Olympic dumbbell bars and four spring collars. Build custom weights using your 2-inch plates—save money and space versus traditional dumbbell sets. Heavy-Duty Steel Construction: Solid steel handles with chrome plating resist rust and support up to 150 lbs per bar. Ideal for aggressive strength training routines. Secure Knurled Grips & Rotating Sleeves: Diamond knurling ensures a non-slip grip, while rotating sleeves reduce joint stress during curls and lifts for safer workouts.