Black & Decker HPD12K-2
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.
A drill with a pistol grip handle is usually compact and lightweight, making the tool suitable for a large variety of applications and easy to use.
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.
A tool/machine with a higher voltage produces more power.
Higher speeds work better for drilling holes in certain types of material, such as steel, aluminium, concrete, etc. The drill speed is measured in rotations per minute (rpm) when the drill has no-load.
A drill with variable speed allows you to switch between low and high speeds, giving you the possibility to take on a wider range of tasks.