Detailed specifications:4 x 1.25-kilogram handgrip discs: diameter: 18.5 cm | height: 19.1 cm | thickness: 3.4 cm. 4 x 2.5-kilogram handgrip discs: diameter: 22.5 cm | height: 23 cm | thickness: 4.2 cm. 2 x 35-cm short bars (2 x 2.5 kg). 14.2 cm knurled grip surface. 4 star-shaped clamping screws. Bar/weight bore diameters: 30/31 mm. Cement-filled weights with plastic coating. Will not scratch the floor. A complete and versatile set With this superb set of 20 kg plastic dumbbells, you'll be able to enrich your workouts. For low loads, simply use the bars with their moderate 2.5 kg weight. You can then increase your performance in stages, adding weights little by little. This way, you can build muscle without overloading your joints. This set offers a wide range of exercises to strengthen your arms, torso and legs. Made from high-quality materials, this dumbbell set will be with you at home for years to come. The weight discs are covered with sturdy plastic, which protects the floor when you place the weights. They fit barbells with a diameter of 30 millimeters and can also be used to complement your long barbell or curl bar. To secure the discs, the star-shaped clamping screws are practical and easy to use. Thanks to the knurled parts of the bars, the grip will be excellent, preventing the dumbbells from slipping out of your hands, even when you're sweating a lot.