A hammer drill contains a hammer clutch or a hammer-like mechanism which provides a circular rotation and a forward driving force. A hammer drill is capable of performing heavy-duty tasks, but it can also be used as a regular power drill.
A reversible drill can alter its rotations from a clockwise direction to a counter clockwise direction, a feature that makes it suitable for both drilling and driving.
The height represents the vertical dimension of the product. We consider a smaller height better because it assures easy maneuverability.
Cordless tools/machines are suited to a variety of different situations, as you are not limited to only working in places with power sources nearby.
We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
The device comes with its own special case or pouch, which is useful for safe transportation.