Small, Medium and Large. What unlocks at each tier and which one to actually carry.
Hammers come from the Support progression track and are bought at HQ. All three need Build Supplies to use.
| Hammer | Weight | Speed | Builds |
|---|---|---|---|
| Small | 0.32 kg | Slow | Small buildables only |
| Medium | 1.23 kg | Moderate | Small plus basic and large |
| Large | 3.18 kg | Fastest | Everything |
The Large Hammer is the only one that builds emplacements, drill rigs, bunkers and towers, and it builds everything else faster, but it is 3.18 kg, and weight class decides whether you can sprint to the Hot Zone.
Worth knowing: a placed FOB carries free Small and Medium hammers at its computer. If somebody else on your squad is running a Large Hammer, you may not need to carry one at all.