Steel Jackhammer is a basic jackhammer available from TechReborn. It has 40k FE energy storage. One can charge it using energy storage blocks, like Battery Box. Jackhammer could be used as a replacement for pickaxe to break stone based blocks, like Stone or Cobblestone very quickly. Steel Jackhammer has efficiency as 12 against stone type blocks compare to 8 for diamond pickaxe. It will cost 50 FE to break one block.