| 1 | Standard metric combination set | 12 pieces: 8–19 mm, in 1 mm increments | General household, bicycle, and automotive maintenance using metric fasteners | Chrome-vanadium steel is common; a polished or satin chrome finish helps resist corrosion | Check that all intermediate sizes are included, and compare the length and thickness of each wrench | A standard set may not include smaller sizes or the larger sizes needed for some vehicle work |
| 2 | Standard SAE combination set | 12 pieces: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, and 1 in | Repairs involving inch-sized fasteners, including many older machines and equipment | Look for clearly stamped sizes and a smooth, corrosion-resistant finish | Confirm the exact fractional sizes supplied and whether the set includes a storage rack or roll | SAE sizes do not substitute reliably for metric sizes; using a near-fit can damage fasteners |
| 3 | Compact metric combination set | 8 pieces: commonly 8, 10, 12, 13, 14, 15, 17, and 19 mm | Basic vehicle tool kits and users who want a smaller, frequently used size range | Chrome-vanadium steel is common; check for legible size markings and consistent jaw fit | Compare the included sizes carefully, since compact sets often omit some intermediate sizes | Fewer pieces mean less coverage for specialized repairs |
| 4 | Compact SAE combination set | 8 pieces: commonly 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, and 3/4 in | Portable tool bags, light maintenance, and smaller inch-sized fasteners | Compare wrench length, open-end alignment, and the quality of the surface finish | A compact roll or holder makes the set easier to carry and helps keep sizes organized | Typically excludes larger sizes that require more leverage |
| 5 | Metric extended-range combination set | 16 pieces: commonly 6–21 mm, in 1 mm increments | Users who need smaller fasteners as well as broader metric coverage | Check the steel type stated by the maker, finish quality, and whether the size markings are stamped or etched | Review the full size list and the storage method; a rack or roll is useful for a larger set | More pieces take up more storage space and may include sizes used infrequently |
| 6 | Extended SAE combination set | About 15 pieces, typically spanning 1/4–1-1/4 in with selected fractional sizes | Equipment and workshop tasks that involve a wider range of inch-sized fasteners | Look for durable steel construction, smooth edges, and a finish that is easy to wipe clean | Since size sequences vary, verify every included size rather than relying on the stated range alone | The larger sizes add bulk and are less useful if most of your fasteners are metric |
| 7 | Dual-system combination set | About 20 pieces across SAE and metric sizes; exact coverage varies by set | Shared workshops or tool kits used on equipment with both measurement systems | Consistent size markings and a divided storage case help distinguish metric from SAE wrenches | Check for duplicated near-equivalent sizes and confirm that each system includes the sizes you use | A mixed set can provide less complete coverage in each system than two dedicated sets |
| 8 | Metric ratcheting combination set | Commonly 8 pieces covering selected sizes from 8–19 mm | Repeated fastening in areas where there is limited room to reposition a wrench | Compare ratcheting mechanism smoothness, overall thickness, and finish; tooth counts vary by design | Check whether the ratcheting box end is reversible and whether its head profile fits your work area | Ratcheting heads are usually thicker than standard box ends and may not fit every tight space |
| 9 | SAE ratcheting combination set | Commonly 8 pieces covering selected sizes from 1/4–3/4 in | Faster work on inch-sized fasteners where a socket or ratchet cannot be used easily | Inspect the ratcheting action and compare head thickness with the available clearance | Confirm the included fractional sizes and whether the ratcheting end changes direction | It can cost more and has more moving parts than a standard combination wrench set |
| 10 | Stubby metric combination set | Commonly 7 pieces: 8, 10, 11, 12, 13, 14, and 15 mm | Confined spaces where a full-length wrench is difficult to swing | Compare overall length, head thickness, and the grip and finish of the wrench body | Shorter bodies improve access; a clearly marked compact holder helps prevent lost pieces | Short handles provide less leverage than standard-length wrenches |