1/2in Drive Impact Hex Driver Set 20pc SAE/Metric - Durable Kit

Our review of the Sunex 2637 and 4507 impact hex driver sets finds them best suited for professional mechanics and serious DIYers who need a rugged, comprehensive hex socket range. The bottom line: these Cr-Mo steel drivers offer one-piece construction and dual size markings that stand up to frequent use with impact tools, and the included heavy duty blow molded case keeps everything organized. If you want impact-rated hex drivers that handle high torque and fit both SAE and metric fasteners, this combined set is a practical, long-lasting choice.

Key Features

• Cr-Mo steel construction: Provides the strength and flexibility to resist cracking under high torque from impact tools and extend service life.
• Solid one-piece construction: Eliminates weak joints for greater durability when used with impact wrenches and drivers.
• Dual size markings: Laser etched and roll stamped markings stay readable for fast identification of SAE and metric sizes.
• Heavy duty storage case: Blow molded case secures 20 pieces for transport and keeps sockets organized on the job.
• Low profile design (4507): Allows access in tight spaces where a standard hex driver would be obstructed.

Who It's For

This kit suits professional technicians and serious hobbyists who regularly use impact drivers or wrenches and need a full span of hex sizes. The combination of SAE and metric sockets covers common automotive and equipment work, and the durable case makes it convenient to carry between jobs.

Less suitable are casual users who rarely use an impact tool or who only need a handful of sizes, since the full 20-piece master set is aimed at broad coverage rather than a minimalist kit. If portability in a small hand toolbox is the top priority, a smaller subset may be preferable.

Pros & Cons

Pros

• Robust Cr-Mo alloy and one-piece construction that tolerate impact torque and frequent use.
• Comprehensive SAE and metric range covers common automotive and maintenance sizes.
• Clear permanent dual size markings make selection quick on the bench or in the field.
• Quality blow molded case keeps all 20 drivers organized and protected during transport.

Cons

• Set is heavier and larger than minimalist kits, which may be overkill for occasional home users.
• Higher durability focus means a higher upfront cost compared with non-impact consumer sets.

Specifications

Brand	Sunex Tools
Drive size	1/2in drive (2637) and 3/4in drive (4507)
Pieces	20-piece SAE/metric (2637) and 5-piece metric (4507)
Material	Cr-Mo steel (chromium-molybdenum)
SAE sizes	1/4in to 3/4in (10 SAE sockets)
Metric sizes	6mm to 19mm (10 metric sockets) plus 14mm-24mm set in 4507
Case	Heavy duty blow molded storage case

Our Verdict

These Sunex impact hex driver sets deliver dependable durability and practical coverage for automotive and heavy maintenance work. The Cr-Mo, one-piece construction and permanent markings make them a durable workshop staple, and the included case helps keep a technician organized. For anyone who frequently uses impact tools, the value comes from fewer broken sockets and quick size identification.

Frequently Asked Questions

Are these sockets rated for use with impact wrenches?
Yes, both sets are made from Cr-Mo steel and built as one piece specifically to handle high torque impact tools.

Do the sockets include both SAE and metric sizes?
The 20-piece master set includes 10 SAE and 10 metric sizes, while the 4507 set adds a 5-piece metric range for larger sizes.

Will the size markings wear off?
No, the dual size markings are laser etched and roll stamped for permanent identification under regular use.