Power Tools 101: A Buyer’s Guide from Castle Building Supplies

Walk down the power tool aisle and it’s easy to get overwhelmed — different brands, battery platforms, voltages, and tool types all competing for attention. But once you understand a few key concepts, picking the right tool (and the right brand) for your project gets a lot simpler.

Here’s a plain-English guide to power tools, plus a look at the brands we carry at Castle Building Supplies.

Corded vs. Cordless

• Corded tools plug directly into an outlet, giving you consistent, unlimited power with no battery to charge or die mid-project. They’re generally lighter than their cordless equivalents (no battery weight) and tend to be the choice for stationary shop tools or heavy-duty continuous work.
• Cordless tools run on rechargeable batteries, trading a bit of raw power and runtime for portability and convenience — no cord to drag around, no outlet needed. Battery technology has improved enough that cordless tools now handle the vast majority of jobsite and DIY work.

Understanding Battery Platforms

This is the single most important thing to know before buying your first cordless tool: batteries are brand-specific, and usually not interchangeable between brands. Once you buy into a brand’s battery platform, every tool you add from that same platform can share your existing batteries and chargers — which is a real cost saver over time, and worth thinking about before your first purchase.

• Voltage (like 12V, 18V/20V, or higher) generally corresponds to power and runtime — higher voltage batteries deliver more power for demanding tools, while lower voltage options are lighter and suited to lighter-duty work.
• Amp-hours (Ah) indicate battery capacity — a higher Ah rating means longer runtime before needing a recharge, though usually at the cost of a heavier, bulkier battery.

Brands We Carry

Milwaukee

Milwaukee is widely regarded as a professional-grade line, especially known for its M12 and M18 battery platforms. Milwaukee’s tools tend to skew toward tradespeople and serious DIYers who want maximum durability and performance, and the brand has one of the largest lineups of specialty and trade-specific tools of any manufacturer — useful if you’re building out a full kit on one battery platform.

DeWalt

DeWalt is one of the most recognized names in power tools, known for its yellow-and-black tools and broad 20V MAX battery platform. DeWalt strikes a strong balance between professional durability and accessibility, with one of the widest tool selections on the market — making it a solid choice whether you’re outfitting a jobsite or a home workshop.

Makita

Makita is a long-standing name in cordless technology, built around its 18V LXT battery platform — one of the largest cordless tool lineups in the industry. Makita’s tools are known for fast-charging batteries and consistently reliable performance across everything from everyday drills to specialty trade tools, making it a strong choice for professionals and serious DIYers who want a single battery platform with a lot of room to grow.

Einhell

Einhell is a German-engineered brand known for its versatile Power X-Change battery platform, which spans everything from power tools to garden equipment and even some household tools — all sharing the same batteries. It’s a strong option for homeowners and hobbyists who want one battery system to cover a wide range of jobs around the house and yard, not just the workshop.

King Canada

King Canada is a Canadian brand with a strong reputation for stationary and shop tools — table saws, band saws, dust collectors, and other equipment built for the workshop rather than the jobsite. If you’re setting up or upgrading a home shop, King Canada is worth a look for reliable, well-priced stationary equipment.

Choosing the Right Tool for the Job

A few common tools and what to look for in each:

• Drills/Drivers: A cordless drill is the workhorse of most tool collections. Look at torque settings (for driving screws without stripping them) and chuck size (larger chucks accept bigger drill bits).
• Impact Drivers: Deliver rotational force in quick bursts, making them better than a standard drill for driving long screws or lag bolts without stalling.
• Circular Saws: Blade diameter determines maximum cutting depth — a standard 7¼” blade handles most framing lumber in a single pass.
• Reciprocating Saws: Useful for demolition and rough cuts where precision matters less than speed and versatility — cutting through nail-embedded wood, pipe, or awkward angles.
• Angle Grinders: Used for cutting, grinding, and polishing metal, masonry, and tile, with the disc size and type determining what material it’s suited for.

A Note on Battery Compatibility

Because batteries aren’t cross-compatible between brands, it’s worth deciding early which platform makes sense for your needs — professional-grade with a huge tool selection (Milwaukee, DeWalt), a broader outdoor-and-indoor ecosystem (Einhell), or dedicated shop equipment (King Canada). Mixing and matching tools within a single brand’s platform is almost always more economical than buying batteries and chargers for multiple systems.

Stop By and Ask

Whether you’re building out a first tool kit or adding to an existing collection, Castle Building Supplies carries Milwaukee, DeWalt, Einhell, and King Canada. Bring in your project — or your existing battery platform — and our team can help you find the right tool for the job.