40 pound set includes two handles, four 3-pound plates, four 5-pound plates, and 4 collarsnCollars are threaded for a secure fit to handlesnTotal weight of the set 40 lbs. including the handles: you can set 20 lbs. per sidenShip daily via USPS with delivery confirmation numbernHoles on weight plates fit standard barnYes4all dumbbells features cast iron plates, solid chrome handles and spin-lock star collars. The textured handles are designed for ergonomic grip. Handles and collars are threaded for a secure fit. Plates are made of high performance durable cast iron with semi-gloss finish for rust resistance and long term use. Set of 40 lbs., 50 lbs. And 60 lbs.: holes on weight plates fit standard bar with diameter of 1". Dumbbell handle has 1-inch-diameter. Set of 52.5 lbs., 105 lbs.: holes on weight plates fit standard bar with diameter of 1.25". Dumbbell handle has 1.25-inch-diameter. Easy to set up by hands and no tools required. The set allows you to vary your daily workout routines with interchangeable weights. You can start from beginning to the next level easily by simply changing the plates. 40 lbs. set Two textured solid chrome handles, Four collars (8 lbs.), Four 5-lbs plates and Four 3-lbs plates. 50 lbs. set Two 4 lbs. handles (with collars), Four 3-lbs plates, Four 7.5-lbs plates (sometimes, we use 8 lbs. instead of 7.5 lbs.) 52.50 lbs. set One (1) durable 15 inches solid steel textured chrome handle (with collars), Eight 5.0-lbs plates, Two 2.5-lbs plates, Two (2) 1.25-lb plates 60 lbs. set Two 4-lbs handles (with collars), Four 5-lbs plates, Four 8-lbs plates 105 lbs. set Twice of the 52.50 lbs. set.