Open End Wrenches Double Head Spanner Wrench Spanners Size: 6-7mm to 41-46mm

Measure the distance across the flats of your bolt head or nut with a caliper or ruler. Match that measurement in millimeters to the corresponding jaw opening listed in the size option. For example, a fastener measuring 13 mm across the flats needs the 12–14 mm wrench, which provides a snug fit on the 13 mm flat.

Yes. The drop-forged construction is designed to handle the torque loads typical of automotive fasteners such as suspension bolts, exhaust clamps, and engine fittings. For extremely high-torque applications (e.g., axle nuts), a torque wrench with a socket is generally the safer choice to avoid overloading any open-end spanner.

The chrome-vanadium alloy finish provides meaningful corrosion resistance for typical workshop and outdoor use. For prolonged exposure to moisture or salt environments, wipe the wrench dry after use and apply a light coat of tool oil to the jaw faces and body to extend service life.

Both wrenches share a 13 mm jaw on one end, but differ on the second head: the 13–15 mm wrench pairs 13 mm with 15 mm, while the 13–16 mm wrench pairs 13 mm with 16 mm. Choose based on which second size you need most frequently. If you regularly work with both 15 mm and 16 mm fasteners, consider purchasing both.

Yes. Open-end spanners engage the flat-to-flat dimension of any hex fastener — bolt heads and nuts of the same metric size share the same across-flats measurement, so a single wrench fits both the bolt head and its matching nut.

Each head is set at an opposing angle (typically 15° from the handle axis). When you run out of swing arc in a confined area, flip the wrench to the other head — the different angle gives you a fresh grip position without needing to remove and reposition the tool. This is especially useful behind engine brackets or inside cabinet frames where full rotation is not possible.

Each listing is for 1 piece (1 pcs) of the selected size combination. Select the specific size you need from the variant options above. If you need multiple sizes, add each size to your cart separately.