Yes4All Adjustable Dumbbells 40, 50, 52.5 , 60, 105 to 200 lbs SET OF 2 DUMBBELLS - 50 LBS TOTAL: TWO 14x 1 handles, FOUR 3-pound plates, FOUR 7.5-pound plates, FOUR collars CAST IRON WEIGHT PLATES FIT 1-INCH STANDARD BAR: Accommodate all standard 1-inch handles. Durable cast iron plates covered with black paint finish preventing rust and corrosion for lifetime use 14-INCH DIAMOND KNURLED CHROME HANDLE: Constructed of high-quality, textured chrome handle for secure, firm, and non-slip grip STAR-LOCK COLLARS WITH LOOSE-RESISTANT RUBBER TRIMS: Threaded ends with star-lock collars provide a safe, secure workout & easy weight plate changes EASY USE & STORAGE: Take seconds to assemble and take out. Compact, convenient, and easy to use and store. All-for-one dumbbells eliminate the need for multiple dumbbells in your workout space Improve cardiovascular health. Increase muscle mass. Burn calories by raising heart rate. Increase bone density, decrease risk of fracture. Improve muscular endurance.