Note: 1. This dumbbell set is specially made for the home gym. Not suitable to use as public fitness equipment. 2. Please keep the dumbbells away from youngsters. Quick overview: This high-quality dumbbell set is made of concrete weight plates and electroplated metal bars. It comes with different weight plates for you to adjust to your desirable dumbbell weight. This weight plate set features 2 pairs of spinlock collars and non-slip handles to provide you with a safe and secure exercise experience. It is great for your upper body workouts, which helps tone and sculpt your arms, shoulders, back and also strengthen your muscles. With this dumbbell set, you can exercise at home, in the office or any place at any time. Details: 1.【Full Set of 2 Dumbbells】Our adjustable dumbbell set comes with 16 weight plates in 4 different weights (5.5lbs, 4.4lbs, 3.3lbs, 2.8lbs), 4 pieces for each weight; 2 iron bars measure at 18.5x1’’ (LxDia.) with a 5.4’’ long handle for each bar; 2 star-lock collars. 2.【Durable Material】This 66lb dumbbell set is constructed of cement weight plates covered with hard plastic and electroplated iron dumbbell bars. Oxidation-proof and water-resistant materials provide you with long service life. 3.【Non-Slip Knurled Handles】This dumbbell set features a hard plastic handle with diamond knurled texture on each bar to increase friction to prevent slipping, ensuring the safety and improving coordination of your every workout. 4.【Extensive Application】This weight set is ideal for both upper and lower bodybuilding exercises for strengthening muscles and also cardio exercises to boost calorie-burning. You can use it at home, in the gym, office or any other place at any time. 5.【All Levels Suitable】These adjustable dumbbells support diverse strength training by changing different weights with a maximum weight of 66lb, a great choice for novices, fitness enthusiasts, professional fitness trainers at all levels. 6.【Secure Spinlock Collars】Our dumbbell bars with threaded ends and star-lock collars prevent plates from loose or falling, ensuring secure gripping and easy weight plate changes. Specifications: Material: plastic, concrete, electroplated iron Weight plate size (Dia.xThickness): 【66LB】 5.5 lb: 8.1x1.6” 4.4 lb: 7.5x1.5’’ 3.3 lb: 7x1.3’’ 2.8 lb: 6.7x1.2’’  Dumbbell bar size : 8.5x1’’ (LxDia.) Handle length: 5.4’’ Weight Plate Quantity: 4pcs 5.5 lb weight plates = 22 lb 4pcs 4.4 lb weight plates = 17.6 lb 4pcs 3.3 lb weight plates = 13.2 lb 4pcs 2.8 lb weight plates = 11 lb 【55LB】 Weight Plate Hole Diameter: 1.2″ Weight Plate Size (Dia. × Thickness): 5.5 lb: 8.3″ × 1.5″ 4.4 lb: 7.7″ × 1.5″ 3.3 lb: 7″ × 1.3″ Dumbbell Bar Length: 17″  Handle Length: 5.5″ Weight & Quantity of Plates & Bars: Dumbbell Bar: 2 pcs, 1.1 lb per bar 5.5 lb Weight Plate: 4 pcs 4.4 lb Weight Plate: 4 pcs 3.3 lb Weight Plate: 4 pcs 【44LB】 Dumbbell Bar Size: 15.4 x 1’’ (L x Dia.) Grip Length: 5.3’’ Weight Plate Quantity:4pcs 4.4 lb Weight Plates = 17.6 lb4pcs 3.3 lb Weight Plates = 13.2 lb4pcs 2.8 lb Weight Plates = 11 lb 【33LB】 Weight Plate Hole Diameter: 1.2″ Weight Plate Size (Dia. × Thickness): 4.4 lb: 7.7″ × 1.5″ 3.3 lb: 7″ × 1.3″ Dumbbell Bar Length: 13″  Handle Length: 5.5″ Weight & Quantity of Plates & Bars: Dumbbell Bar: 2 pcs, 0.8 lb per bar 4.4 lb Weight Plate: 4 pcs 3.3 lb Weight Plate: 4 pcs