The main advantage of the Dumbbell and Barbell Weight Set Bundle is that it uses Olympic Weight Plates and all the bars are compatible with any 2" (50mm) hole diameter weight discs. So you can use the weights plates included in this bundle with any of the bars that come with it, and with any other Olympic weight discs you might have at home, or that you'll buy in the future. This pack features 2 dumbbell bars that can be loaded with a versatile range of Cast Iron Discs. It also includes one of two weight bars for you to choose from. If your plan is doing compound movements, like squats or deadlifts, get the version with 7" Barbell. Or if you are planning on doing mainly arms workouts, like biceps curls or triceps extensions, then you should get the version with the EZ Curl Bar. Option 1 - 7" Barbell: What's included Total of 55kg (bar weights 20kg). 4 x Olympic Cast Iron Tri-Grip Disc | 1.25kg 4 x Olympic Cast Iron Tri-Grip Disc | 2.5kg 4 x Olympic Cast Iron Tri-Grip Disc | 5kg 2 x Hit Fitness Olympic Dumbbell Bar 1 x Hit Fitness Home Olympic Weight Bar | 7ft (20kg) 2 pairs of Hit Fitness Spring Collars 50mm Option 2 - EZ Curl Bar: What's included Total of 43kg (bar weights 8kg). 4 x Olympic Cast Iron Tri-Grip Disc | 1.25kg 4 x Olympic Cast Iron Tri-Grip Disc | 2.5kg 4 x Olympic Cast Iron Tri-Grip Disc | 5kg 2 x Hit Fitness Olympic Dumbbell Bar 1 x Hit Fitness 47" EZ Curl Bar (8kg) 2 pairs of Hit Fitness Spring Collars 50mm