A cylindrical wrench with a hexagonal end fitting over the head of a nut, used especially when the nut is difficult to reach. Also called box-end wrench.
More example sentences
- You'll need a screwdriver, a small box wrench or crescent wrench, or if you have a 1/4 ‘drive socket set that's even better.’
- You can adjust the rear travel with a 5mm hex wrench and a 10 mm box wrench, but you'll want to adjust the shock's air pressure, too.
- I'd probably go with a box wrench there… more knuckle room.