No set of tools is complete without a good angle grinder. Plumbers, welders, electricians, auto enthusiasts, and DIYers can all benefit from their power and versatility. Ready to learn more? Our informative buying guide can help you pick the right model for your needs. At the end, you can read all about our top choices. Our favorite, DeWalt's 4 1/2-Inch Angle Grinder, has the quality and work-focused features you'd expect from this dependable brand, and it's very affordable, too. Considerations when choosing angle grinders Size and power Angle grinders are rated by the size of disc (or wheel) they accept. Two- and three-inch models are available, but four and a half inches is probably most common. Heavy-duty tools run seven to nine inches. While some are quite compact, others can be bulky. It's worth checking overall dimensions and weight, especially if you're going to be using one for long periods. As with most power tools, you have a choice of corded or cordless — though most are corded. Corded tools are rated by amps. Five or six amps is common on mid-range angle grinders, but some are as high as 11 amps. Larger models can reach 14 amps, which is a practical limit since standard electrical outlets only provide a 15-amp maximum supply. Some heavy-duty angle grinders use horsepower instead. Cordless models are either 18 or 20 volt (which in real terms is the same thing). The important element here is the Amp hours (Ah) of the battery. Though the numbers don't directly relate to run time, a 4Ah battery provides power for at least twice as long as a 2Ah version. Cordless angle grinders are power-hungry tools, so you want the maximum Ah possible. We wouldn't recommend less than 4Ah. Up to 9Ah versions are available for some brands, though they are expensive. Features Gear material On lower-quality angle grinders, it's possible for the drive gears to be made of nylon or similar plastics — we would caution against buying them. Metal gears are much more durable. Guard A guard is provided to channel away dust, debris, and particularly sparks when you're grinding metal. Guards usually offer some adjustment options. The amount and their ease of use varies. Side handle A side handle is invariably included, which gives greater control than just gripping the body. Most can be shifted from right- to left-handed, and some have three positions. They can be removed completely if they get in the way. Spindle lock A spindle lock is convenient, allowing you to use a single spanner to change the disc. Some inexpensive angle grinders don't have one, so they need two spanners. Accessories It's nice to have a case to keep grinder, discs, and spanner together, but often you just get the cardboard box it came in. Discs are sometimes provided. It's important to check whether they're metal- or stone-cutting before use (composition is different and marked on the disc). Discs that are like small chainsaws can be used to carve wood. Pads and buffers offer an alternative for polishing, though a dedicated machine is usually used in pro shops. Price You can get inexpensive angle grinders from no-name brands for under $20, but decent quality starts at around $30. Between $50 and $100 you have a wide choice of top-quality models. The only reason you need to pay more is either for cordless, which can run to $150, or heavy-duty industrial models, which can reach around $300. FAQ Q. What safety gear do I need when using an angle grinder? A. Standard safety clothing is recommended: gloves, dust mask, and goggles or a face shield. Ear defenders are also a good idea, as angle grinders tend to be loud. Q. Do angle grinders need much maintenance? A. Very little. If you're cutting stone, cement, etc., wipe off the dust when you finish (or use a blow gun if you have one). Corded models may need the motor brushes replaced periodically, but it's a simple job. Angle grinders we recommend Best of the best: DeWalt's 11-Amp 4 1/2-Inch Angle Grinder Our take: Outstanding performance and feature set for the professional or serious DIY user. What we like: High-performance motor. Excellent paddle switch with safety lock. Dust ejection keeps out harmful debris. Fast guard adjustment. Slim gear case gets into tight spaces. Nice carry case. What we dislike: Nothing. Best bang for your buck: Porter-Cable's 6-Amp 4 1/2-Inch Angle Grinder Our take: Powerful, low-cost tool for electricians, plumbers, and other trades. What we like: High-speed motor for fast material removal. Rotating gear housing and 3-position handle add versatility. Steel gear case improves durability. Useful quick-detach guard clamping. What we dislike: Some problems with motor overheating. Choice 3: Milwaukee's M18 Fuel 4 1/2 or 5-Inch Angle Grinder Our take: The freedom of cordless for all those light-duty jobs. What we like: Great tool provided you understand its modest capabilities. Can take either 4-1/2" or 5" discs. Reasonably light and maneuverable. Well made. What we dislike: Expensive. Uses charge quickly. Battery & charger not included. Bob Beacham is a writer for BestReviews. BestReviews is a product review company with a singular mission: to help simplify your purchasing decisions and save you time and money. BestReviews never accepts free products from manufacturers and purchases every product it reviews with its own funds. BestReviews spends thousands of hours researching, analyzing and testing products to recommend the best picks for most consumers. BestReviews and its newspaper partners may earn a commission if you purchase a product through one of our links. Distributed by Tribune Content Agency, LLC.