This is a 15 mm combination spanner, a hand tool with one open jaw and one ring (box) end sized for 15 mm metric fasteners. Its primary use is to tighten and loosen metric nuts and bolts where a slim, accurate engagement is required — the open end gives quick entry onto the fastener while the ring end provides full perimeter contact to reduce rounding and allow higher torque.

The spanner is manufactured from chrome vanadium steel (Cr-V) that has been heat-treated for strength and toughness. The working surfaces are hardened to resist wear and the tool is finished with a bright chrome plate to provide corrosion resistance and easy cleaning. The ring end is a 12-point box fit to allow indexable turns in confined spaces and the open end is offset by approximately 15° to improve access on adjacent components. As a metric tool, the nominal size is 15 mm; there are no threads or drive attachments on this hand tool.

Dimensions and tolerances are produced to recognised industry standards for combination spanners, meeting common DIN and ISO dimensional requirements used by professional tool manufacturers. This ensures consistent fit on metric fasteners across automotive, engineering and maintenance applications.

Typical applications include automotive repair, plant and machinery maintenance, general engineering assembly, plumbing and heating installations, and any workshop or site where metric fasteners are used. The combination of a thin-profile open jaw and a full-contact ring end makes the 15 mm spanner particularly useful where space is restricted or where repeated application of torque risk rounding fastener corners.

Key benefits are its corrosion-resistant chrome finish, the higher strength and fatigue resistance provided by heat-treated Cr-V steel, and the compatibility with standard metric nuts and bolts. The 12-point ring end permits easier repositioning on fasteners and the chamfered jaws help reduce slippage and damage to fastener edges.

Duchy Fasteners stocks the 15 mm combination spanner individually and as part of metric spanner sets. Sizes and pack options include single pieces, common 6–12 piece metric sets and bulk trade packs; contact us for specific set configurations and trade quantities. Product code DR35394 identifies this spanner in our range.