to having a Diamond Pickaxe and Diamond Shovel in just one tool. However, it is a bit faster, has infinite durability, and it requires EU to be used. The Diamond Drill can mine Obsidian about 2x faster than a Diamond Pickaxe. If used in combat, it deals 1 heart for every hit.
The Diamond Drill uses around 50-80 EU per block mined. The Diamond Drill can be charged in a Generator, BatBox, MFE, MFSU and in all Charging Benchs. However, without a BatPack or LapPack, the drill will last for an extremely short time, since it can only hold 10,000 EU. It is highly recommended to bring one of the above or a few RE-Batteries along in order to recharge your drill.