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Gray Tools 1-3/4 inch combination wrench, 12 point, black oxide finish

Gray Tools

Gray Tools 3156B Combination Wrench 12 Point Black Oxide Finish

SKU CH-4ED4-JTGDC

12-point combination wrench with black oxide finish for corrosion resistance

  • 12-point broaching gives a secure fit on 1-3/4" hex fasteners
  • Black oxide coating resists corrosion for longer tool life
  • Meets ANSI standards so the wrench performs to recognised specs
  • Gray Tools brand backs professional-grade durability
  • Model 3156B identifies the exact size for quick selection

Professional Combination Wrench

The Gray Tools 3156B is a 12-point combination wrench designed for professional mechanics and serious DIY users who need reliable fastening on large hex fasteners. Its precision broaching delivers a secure fit that reduces rounding risk on stubborn bolts. A corrosion resistant black oxide finish protects the tool surface in demanding shop environments.

Suited For Heavy Fastening

This wrench suits technicians working on industrial equipment, heavy machinery or large vehicle suspension components where a 1-3/4 inch hex size is required. The 12-point drive allows engagement at multiple angles in tight access areas. Buyers who need smaller fastener coverage or a full wrench set for general maintenance should look at other options.

1-3/4 Inch Hex Opening

The single specification that determines fit is the 1-3/4 inch hex opening, which must match the fastener exactly. The 12-point broaching meets ANSI standards for dimensional accuracy and torque performance. Verify the fastener size before purchase because this wrench covers only that specific dimension.

Highlights

  • 12-point broaching gives a secure fit on 1-3/4" hex fasteners
  • Black oxide coating resists corrosion for longer tool life
  • Meets ANSI standards so the wrench performs to recognised specs
  • Gray Tools brand backs professional-grade durability
  • Model 3156B identifies the exact size for quick selection

Specifications

BrandGRAY TOOLS

Questions about this item

What size bolt or nut does the 1-3/4 inch opening on the 3156B wrench fit?

The 1-3/4 inch opening fits fasteners with a 1-3/4 inch hex size, which is the exact size marked on the wrench.

Will the 12 point drive on this wrench engage the 6 point bolts already in my toolbox?

Yes, the 12 point broached opening engages both 12 point and standard 6 point fastener heads securely.

How can I confirm the black oxide finish on the 3156B is providing the corrosion resistance claimed?

The black oxide coating should appear as a uniform dark surface; if rust spots form on the jaws or shank during normal use, the finish is no longer protecting the steel.

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