Hammer

This doesn't exist in Minecraft, only for Mods and our Suggestions.

Hammers are both Weapons and Tools which is classified in the Miscellanous group. They can be obtained by crafting or killing a Mutant Zombie (Stone Hammer).

Crafting
They are used to be crafted like shovels but with the Block version of it.

Uses
They can be used to crush any Vegetable (Wheats, Carrots and Potatoes), Ice and Mobs. When crushing Ice, you can obtain it but water will flow and if it drops in the water it will disappear. It can be used to crush Mobs (especially Passive and Neutral Mobs (exept for Enderman) ).

Trivia

 * They are all used from Blocks to be crafted.