The Tinker's Hammer is an item added by Embers. It is used to control the direction of Ember flow and for linking power between Ember Emitters, Ember Receptors, and Ember Relays. To direct Ember flow, shift right-click the destination block with the Hammer then right click the origin block. Ember Receptors are always destination blocks and Ember Emitters are always origin blocks.
The Tinker's Hammer is also used for controlling Fluid Pipes and Item Pipes, disabling or enabling connections between pipes and blocks by right clicking on the pipes.