The handle of the connector is engraved with knurling, which can better grip and improve safety during exercise. Compatible with 1 inch rotating lock dumbbell.Extended strength training: Our adjustable dumbbells with dumbbell connectors provide you with excellent versatility and interchangeability. Now you can quickly adjust your training level or easily switch between exercising dumbbells or barbells. Easy to use and store: it can be assembled and disassembled in seconds. Compact, convenient, easy to use and store. The all-in-one dumbbell eliminates the need for multiple dumbbells in the exercise space. Barbell connecting rod length: 30cm / 12 inches. Dumbbell bar length: 38 cm/15.2 inches. Hole diameter: 2.5 cm / 1 inch. 8 x 5.5 lb printing plate. 4 2.75 pound plates. 4 x 1.1 lb printing plate. The item "66lb Weight Dumbbell Set Adjustable Fitness GYM Home Cast Full Iron Steel Plates" is in sale since Tuesday, September 7, 2021. This item is in the category "Sporting Goods\Fitness, Running & Yoga\Strength Training\Dumbbells". The seller is "wet6orefer" and is located in New York, New York. This item can be shipped to United States.