Spanner Combination Wrench CRV Open Ended Round Fixed Head Spanners 6mm - 30mm

Match the wrench size to the across-flats (AF) measurement of your nut or bolt head. For example, an M8 bolt typically uses a 13mm spanner, while an M10 bolt commonly requires a 17mm. Check your fastener's specification sheet or measure with calipers if unsure.

CRV stands for Chrome Vanadium Steel, an alloy that combines chromium for corrosion resistance and vanadium for added toughness and strength. This makes the wrench more resistant to bending or cracking under high torque compared to standard carbon steel tools.

Yes. The size range of 6mm–30mm covers the majority of metric fasteners found in passenger vehicles, including brake calipers, suspension bolts, engine mounts, and exhaust hardware. The fixed head end is particularly useful in tight spaces where a ratchet cannot swing freely.

The open end allows you to slide the wrench onto a fastener from the side — useful for quick engagement or when the bolt end is not accessible. The round fixed head fully encircles the nut, distributing force evenly across all six faces and reducing the chance of slipping or rounding the fastener under load.

The CRV material and surface finish provide a degree of corrosion resistance, but prolonged exposure to moisture can still cause surface oxidation over time. Wiping the wrench with a light machine oil after use and storing it in a dry environment will extend its service life.

These spanners are sized in metric (mm). While some metric sizes are close in dimension to SAE equivalents, using a metric wrench on an imperial fastener — or vice versa — risks rounding the fastener corners. For SAE fasteners, use a wrench sized in fractional inches.

Select your required size from the Size dropdown above and add it to your cart. Repeat the process for each additional size you need. Each size is sold individually (1 Pcs per order) so you can build a set tailored to your specific fastener requirements.