The best 3/8-inch metric impact socket set depends on whether you need broad size coverage, deep and shallow sockets, or access around obstructions. The CASOMAN 49-piece set is a strong fit for buyers who want metric and SAE sizes in one kit. The AMM and MIXPOWER sets add extensions and adapters, while CASOMAN’s 27-piece set focuses on metric deep and shallow sockets. For angled access, the 20-piece universal set is the specialized choice.
| Set | Best For | Standout Details |
|---|---|---|
| CASOMAN 49-Piece | Mixed metric and SAE tasks | 8–22 mm and 5/16–3/4 inch; 6-point sockets |
| AMM 48-Piece | Added reach and connections | Extensions, universal joint, and adapter |
| CASOMAN 27-Piece | Metric-only deep and shallow work | 7–19 mm; 6-point design |
| Universal Impact Set | Angled access | Swivel sockets covering 8–24 mm |
| MIXPOWER 49-Piece | Metric and SAE coverage with accessories | Deep and shallow sockets, extensions, and adapters |
CASOMAN 49-Piece SAE and Metric Set
This set is best for buyers who want one kit for common metric and SAE fastener sizes. Its listed range includes 8–22 mm and 5/16–3/4 inch sockets, and the product name specifies a 6-point design and Cr-V steel.
Choose this if you value both measurement systems in a single 3/8-inch drive set. That broadens its usefulness for mixed repair tasks compared with a metric-only kit. The listed metric range ends at 22 mm, so choose another option if you specifically need larger metric sizes or deep and shallow sockets identified separately.
AMM 48-Piece Set With Extensions
The AMM set is best for buyers who want socket coverage plus reach accessories. Its listed contents include standard SAE sizes from 5/16 to 3/4 inch and metric sizes from 8 to 22 mm, along with 3-inch and 6-inch extension bars, an impact universal joint, and a 3/8-to-1/2-inch impact adapter.
Choose this if extensions and a universal joint are useful for your work. The product name also identifies Cr-V construction. Its listed metric range stops at 22 mm, which may not suit jobs requiring larger sockets. The supplied information does not specify deep and shallow socket coverage.
CASOMAN 27-Piece Metric Deep and Shallow Set
This set is best for buyers who want metric-only deep and shallow sockets in a focused range. The listed sizes run from 7 to 19 mm, and the kit includes an impact drill socket adapter. Its sockets use 50BV30 Chrome-Vanadium steel with a black phosphate finish.
The 6-point flank-drive design is intended to grip the flat sides of fasteners rather than their corners. Choose this set if deep and shallow options within 7–19 mm matter more than SAE coverage. Avoid it if you need metric sockets above 19 mm or a broader set of drive accessories.
Universal Swivel Impact Socket Set
This 20-piece set is best for buyers who need to reach fasteners at an angle. The product name lists 6-point metric universal-joint sockets from 8 to 24 mm, Cr-Mo construction, extension bars, a socket adapter, and a drill bit adapter.
Choose this option when access is the priority, especially compared with a standard socket set that does not list swivel sockets. Its stated size range reaches 24 mm, but it is a 20-piece specialized set rather than a broad SAE-and-metric kit. Check the product listing for the exact included size breakdown before buying.
MIXPOWER 49-Piece Deep Impact Set
The MIXPOWER set is best for buyers who want deep and shallow metric and SAE sockets alongside several accessories. Its listed metric sizes are 8–19 mm and 21–22 mm; SAE sizes run from 5/16 to 3/4 inch. The kit also lists 3- and 6-inch extensions, a universal joint, a 3/8-to-1/2-inch adapter, and a drill adapter.
It is made from drop-forged, heat-treated 50BV30 Cr-V steel with a black phosphate finish. The 6-point radius-corner design is described as placing force on fastener walls. Note that the listed metric sizes skip 20 mm.
Buying Guide: How to Choose a 3/8-Inch Metric Impact Socket Set
Which metric size range do you need?
Compare the exact sizes, not just the piece count. These sets range from CASOMAN’s 7–19 mm coverage to the universal set’s stated 8–24 mm range. MIXPOWER lists 8–19 mm and 21–22 mm, with no 20 mm socket in its stated selection. If a particular fastener size is essential, verify it appears in the set before choosing.
Do you need deep sockets, shallow sockets, or both?
Deep sockets can suit fasteners with longer exposed threads or recessed access, while shallow sockets are more compact. The CASOMAN 27-piece and MIXPOWER listings explicitly identify deep and shallow sockets. The other product details provided do not establish the same configuration, so check the listing if socket depth is a deciding factor.
Will extensions or swivel access help?
Extensions add reach, and a universal joint or swivel socket can help approach fasteners at an angle. AMM and MIXPOWER list extension bars and universal joints. The 20-piece set specifically identifies universal-joint sockets. These accessories make those options more suitable when straight-on access is limited.
Is a mixed SAE and metric kit useful?
A combined set can reduce the need to switch kits when working with both measurement systems. CASOMAN’s 49-piece and MIXPOWER sets list SAE and metric sizes. The 27-piece CASOMAN set and 20-piece universal set focus on metric sockets.
Frequently Asked Questions
What does 3/8-inch drive mean?
It describes the square drive connection size used to attach the socket to a compatible tool. Confirm that your tool and accessories use a 3/8-inch drive before purchase.
Are 6-point sockets suitable for impact work?
Several listed products specify 6-point sockets. Their product details describe designs intended to engage the fastener’s sides. Select an impact socket set, rather than assuming a standard hand-tool socket is suitable for impact use.
Which set has the largest stated metric range?
The universal impact set lists metric sizes from 8 to 24 mm. Check its listing for the precise included sizes because the full size-by-size breakdown is not provided here.
Which option includes both deep and shallow sockets?
The CASOMAN 27-piece metric set and MIXPOWER 49-piece set explicitly list deep and shallow sockets.