Proto Single 5/16" SAE Box End Wrench, Spline Drive, Built for Garage and Jobsite Tasks, Sturdy Design for Everyday Work, Pro Mechanic Wrench for Auto Repair and Heavy Shop Work

Proto Single 5/16" SAE Box End Wrench for Pro Shop Use
✔️ 1 box end wrench, 5/16" size, spline drive, made for daily use

The Proto single box end wrench wraps all the way around the nut for max grip and less chance of rounding. You'll see it in heavy equipment repair, truck service, and auto shops, and it's ready to work hard every day.

✅ Pack size: 1 box end wrench
✅ Brand: Proto
✅ Size: 5/16"
✅ Measurement system: SAE
✅ Feature: spline drive
✅ Mfr part number: J1118SPL

💡 Why use a box end wrench instead of an open end?
A box end wraps all the way around the nut for a better grip.

• Less chance of slipping or rounding off the bolt
• Great for breaking loose tight or rusty fasteners
• Offset box ends help you clear your knuckles