Dumbbell (Fallout 4)

The 20lb and 160lb dumbbell are junk items in Fallout 4 and Fallout 76.

Characteristics
Dumbbells consist of a steel pole with lead weights on each end equating to either 20 or 160lbs, and were intended to be lifted with one arm.

Crafting
The dumbbells can be broken down into its individual components for use in crafting:

Fallout 4

 * Two in the Boxing Gym.
 * Two at the Atom Cats garage.
 * In the Federal supply cache 84NE.
 * Two can be found at the deck of the Wreck of the FMS Northern Star.
 * One in Madden's Gym.
 * One in Mass Fusion building.
 * Can be bought from some vendors.

Fallout 76
Charleston Fire Department has the following:
 * 1 160lb barbell
 * 3 20lb dumbbell
 * 1 40lb dumbbell