A cordless drill driver is the most convenient, portable solution for the majority of drilling and fastening projects around the home. A rechargeable battery pack gives you access to all the power and mobility you need.
Cordless drill drivers are available in models with maximum power ranging from 3.6 volts to 20 volts — the most popular models that will usually meet homeowners' needs.
Available in cordless and corded models, hammer drills are practical for the toughest jobs, delivering a powerful hammering action that makes it easy to drill into dense materials such as cement, block and brick. The hammer action can be turned on and off, so the tool can also be used as a standard drill. For projects involving even denser materials, such as concrete, a rotary hammer drill is recommended for a more powerful hammering mechanism.
Harder materials or larger bits need to be worked at a higher speed than softer materials and smaller bits. Variable transmissions allow you to choose the right setting for the job at-hand. Speed is measured in revolutions per minute or RPM, while impact rate is measured in beats per minute or BPM.
This refers to the strength or turning force of the drill. It’s important to note the speed and torque are inverse, meaning the higher speed output, the less torque can be applied. That’s why it’s good to choose a tool that allows you to select the speed and power output to optimize the drill or fastening job you are doing.
Most common drills come with either a 3/8"- or 1/2"-sized chuck to hold the bit. The most common and preferred size is 1/2”, as it can hold larger-sized bits and accessories. A chuck can be keyed, meaning tightened or loosened with a key, or keyless, meaning loosened by hand for convenient, frequent bit changes. Impact drivers typically have a 1/4” hex-shank quick-release chuck, meaning it will only accept 1/4” hex-shanked bits designed for convenient bit-change, due to the simple pull-and-replace feature on this tool.