What Is a Combination Wrench Set and What Is It Used For?

What a combination wrench actually is

The name describes the design. One tool combines two wrench styles: an open end and a box end. Both ends fit the same size of nut or bolt head, so a 13 mm combination wrench has a 13 mm opening at each end.

That pairing is the whole idea. You get two ways to grip a fastener without reaching for two tools. The open end slips on from the side. The box end wraps all the way around the fastener for a firmer hold.

A combination wrench set is simply a collection of these wrenches in stepped sizes. Most sets are sold in a roll-up pouch, a hard case or a rack, with the size printed or stamped on each wrench.

What a combination wrench consists of

Each wrench is a single piece of forged or machined steel with three main parts. Knowing them makes it easier to read a spec sheet.

Chrome vanadium is the steel named most often in the listings we compare, and finishes such as chrome, mirror polish or plating are meant to slow rust.

• Open end: a U-shaped jaw that slides onto a fastener from the side. It is handy when a bolt has a pipe, rod or wire running through it.
• Box end: a closed ring with either 6 or 12 points inside. A 12-point design engages at more angles, which helps in cramped spots. A 6-point design grips the flats of a stubborn nut more firmly.
• Handle (shaft): the lever between the two ends. Length affects how much turning force you can apply, and many wrenches angle the box end about 15° so your knuckles clear the work surface.
• Size marking: the number stamped or etched on the handle. Clear markings save time when you are sorting through a full roll.

What a combination wrench set is used for

These are general-purpose hand tools for hex fasteners. Typical jobs include car and motorcycle repair, bicycle adjustments, appliance maintenance, assembling furniture and equipment, and everyday work around the garage or workshop.

The two ends suit different stages of a job. The open end is quick for running a nut down or backing it off when there is little resistance, and it fits where a box end cannot be slipped over the top. The box end is better for the first break of a tight fastener and for final tightening, because it contacts the fastener on all sides and is less likely to round off the corners.

Many people also pair two wrenches on one bolt: one holds the bolt head while the other turns the nut. A set with every size in a series makes that easy because you always have a matching pair.

If your work includes nuts that are buried or covered by a line or tube, a different tool may suit better. Our best crowfoot wrench set page covers wrenches that attach to a ratchet or extension for those cases.

What is in a typical set

Sets differ in piece count, size range, unit system and storage. The table below uses published specifications from the listings on our comparison page.

Piece count includes each wrench, and on sets that mix inch and metric sizes, both systems count toward the total. A dash means the listing did not give that detail.

How to use a combination wrench safely

A few habits make the tool work better and keep your hands out of trouble. Most injuries with wrenches come from a slipping tool or a fastener that suddenly gives way.

Wear safety glasses when working on rusty or seized fasteners, since flakes of metal and debris can fall into your eyes. Gloves help with grip and cuts, but keep them snug so they do not catch on moving parts.

• Choose the exact size. A wrench that is slightly too big can round off the fastener corners and slip.
• Seat the wrench fully on the fastener. For a tight bolt, start with the box end.
• Pull the wrench toward you instead of pushing away from you. If it slips, you are less likely to punch into something sharp.
• Keep your wrist straight and your body balanced, and do not stand in an awkward position when applying force.
• Do not slide a pipe over the handle for extra leverage, and do not hit a wrench with a hammer unless the tool is made for striking. Either can damage the tool or cause it to break.
• Disconnect the battery or power before working near electrical parts, and support a raised vehicle on proper jack stands, never on a jack alone.

Choosing a set that fits your work

Start with sizes. Check the smallest and largest wrenches in a set, then decide whether you need SAE, metric or both. Cars and tools from different makers often mix systems, so a combined set can save you from buying a second one. A compact set can stop at 19.05 mm, while a larger set such as the SK and VEVOR sets above reaches 32 mm.

Next, look at the box end and offset. A 12-point box end is easier to engage in tight spots, while ratcheting versions, like the 90-tooth CRAFTSMAN set above, can save time because you do not lift the wrench off the fastener between turns. Ratcheting adds moving parts, so consider how much you value speed over simplicity.

Finally, think about storage and weight. A roll-up pouch is compact, while a hard case protects the tools and makes missing pieces easy to spot. If you carry the kit often, weight matters: the sets in the table above range from 3.6 lb to 18.36 lb among those that list it.

When you are ready to compare specific products, our best combination wrench set page puts sizes, steel, finish, box-end shape and storage on one spec sheet.

Frequently asked questions

Is a combination wrench the same as an open-end wrench?

No. An open-end wrench has an open jaw on both ends. A combination wrench has one open end and one box end, both for the same size.

Why do the two ends have the same size?

So you can switch between them without changing tools. Use the open end for quick turning or tight access from the side, then flip to the box end for more grip when a fastener is snug.

Do I need both SAE and metric wrenches?

It depends on what you work on. Many vehicles and tools use one system, but mixed equipment is common, so a set that includes both can be more convenient.

What does 12-point mean on a box end?

It describes the number of internal points in the ring. Twelve points let the wrench engage a hex fastener from more angles, which helps when swing room is limited.

Can a combination wrench set replace sockets?

Not entirely. Wrenches reach places where a socket and ratchet will not fit, but sockets are often faster on open, accessible fasteners. Many toolboxes carry both.