ITEM NAME:12 '' Standard Barbell Rod Extension Junction Rod With Description: Made of qualified steel- anti-slip, high strength, solid and wear-resisting Easily converts two dumbbell bars into one barbell in seconds One wrench and two screws will be sent together with the rod, which will help you install it very easily. Standard long enough thread length ensures secure lock Great replacement for your dumbbell, effectively improve your strength training. Specification: Material: Steel Size: Approx. Length: 30cm/11.8 inch Inner Diameter: 2.5cm/0.98 inch Package Includes: 1 Piece Dumbbell Connecting Rod 1 Piece Hex Wrench 2 Pieces Screws Note: Please allow slight difference due to mannual measurement. Color might be slightly different due to different displayers.Thanks for your understanding. SKU: ALU0025280854046495.Easily converts two dumbbell bars into one barbell in seconds. 1 Piece Dumbbell Connecting Rod. Made of qualified steel- anti-slip, high strength, solid and wear-resisting. Standard long enough thread length ensures secure lock.