Description: [Decompression connecting rod]: Inside is a rigid steel tube, wrapped with high quality foam on the outside to reduce pressure and slip. [Funcion]: PVC plastic nut with deepened thread design, prevent weight plates from sliding off during the exercise. [Feature]: Precision thread Dumbbell Handle, due to their size and versatility, adjustable dumbbell bar can be used to create a variety of movement patterns to movement specific strength. [Great choice]: Dumbbell rod is ideal for various warm ups sports and strength workouts like arms, shoulder, abdominal, legs or back training. [Application]: Make your dumbbell to barbell. Great replaces for your old dumbbell rod, effectively improve your strength training.Great for household fitness device use. Specification: Material: Metal Size Chart: 35cm/13.78inch 40cm/15.75inch 47cm/18.50inch 51cm/20.08inch 55cm/21.65inch Package Includes: 1 Piece Dumbbell Bars 2 Piece Nuts Note: Please allow slightly errors due to manual measurement and different monitors.