Open-end and Flat Wrenches. The most basic type of wrench, open-end and flat wrenches have open jaws that slip onto nuts and bolts. Because they can be slim and short, these wrenches are especially useful in tight spaces. They’re not adjustable, so they’re sold in wrench sets of all sizes. They’re available in both SAE sizes, which are expressed in fractions of an inch, and in metric sizes. 
As well as generating so much torque, cordless impact wrenches are very precise, which makes them ideal for numerous applications. It’s much safer to use this type of power tool when working on a construction site, or when securing lug nuts on a wheel, as opposed to doing it by hand. Even though all impact wrenches function in the same way, if you perform a cordless impact wrench comparison, it’s easy to notice that they do have many differences.
One of the features on the Milwaukee 2767 that stood out is the “Bolt Removal” mode. This was not found on any other impact wrench we tested. On the push-button speed selection at the base of the impact, you can select 1-3. Setting 1 is the slowest and 3, the fastest. The fourth selection is the “Bolt Removal” mode, indicated by a circular arrow designation. When this mode is selected, the user holds their finger on the trigger—once the fastener breaks loose, the Milwaukee senses this and slows the RPM to just 750 to finish removing the nut. This keeps the nut from flying across the shop.

This Diamond Series torque wrench by Capri Tools This Diamond Series torque wrench by Capri Tools features a diamond contour grip design that combines an ergonomic sure-grip and a lightweight impact resistant construction. The diamond contour grip is designed for a comfortable and steady hold. The handle is made of premium impact resistant materials which is 30% lighter ...  More + Product Details Close
clamp ratchet wrench clamp ratchet spanner An open-ended multi-size ratchet wrench. The ratcheting mechanism allows the nut to be clamped-on or loosened with a reciprocating motion; flip the wrench to change direction of the drive. The wrench takes the advantage of the clamp action to allow multiple sizes in both SAE and metric standards. Each wrench typically will allow up to 3 non-metric sizes and 3 metric sizes. adjustable

Wrench, also called spanner, tool, usually operated by hand, for tightening bolts and nuts. Basically, a wrench consists of a stout lever with a notch at one or both ends for gripping the bolt or nut in such a way that it can be twisted by a pull on the wrench at right angles to the axes of the lever and the bolt or nut. Some wrenches have ends with straight-sided slots that fit over the part being tightened; these tools are known as open-end wrenches and are made in various sizes to fit specific bolt and nut sizes.


One of our favorite features on the device is the brushless motor that allows it to produce impressive output power while still staying cooler than many of its rivals on the market. And if that weren’t enough, it boasts the ability to generate up to 700 ft-lbs of fastening torque and up to 1100 ft-lbs of nut busting torque making it a great tool for anyone who finds themselves trying to remove stubborn nuts on a regular basis.

We have nine different cordless high torque impact wrenches from eight different manufacturers, including a couple of the tool-truck brands. Snap-on declined to participate in the best cordless impact wrench shootout, so their placement will remain a mystery. Maybe you can ask your local driver where they would fall. Back to the ones who did enter their trusty steeds.


Many users choose to equip their air-powered impact wrenches with a short length of air hose rather than attaching an air fitting directly to the tool. Such a hose greatly aids in fitting the wrench into tight areas, by not having the complete coupler assembly sticking out the back of the tool, as well as making it easier for the user to position the tool. An additional benefit is greatly reduced wear on the coupler, by isolating it from the vibration of the tool. A short length of hose also prevents the air fitting from being broken off in the base of the tool if the user loses their grip and the tool is allowed to spin.

Various methods are used to attach the socket or accessory to the anvil, such as a spring-loaded pin that snaps into a matching hole in the socket, preventing the socket being removed until an object is used to depress the pin, a hog ring which holds the socket by friction or by snapping into indents machined into the socket, and a through-hole, where a pin is inserted completely through the socket and anvil, locking the socket on. Hog rings are used on most smaller tools, with through-hole used only on larger impact wrenches, typically ¾" drive or greater. Pin retainers used to be more common, but seem to be being replaced by hog rings on most tools, despite the lack of a positive lock. ¼" female hex drive is becoming increasingly popular for small impact wrenches, especially cordless electric versions, allowing them to fit standard screwdriver tips rather than sockets.
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