This is a 16x17mm flat ring spanner: a double-ended, closed-ring hand tool with 16mm and 17mm ring heads designed for tightening and loosening metric hexagon nuts and bolts in confined spaces. Its flat, low‑profile design gives access where bulkier box or combination spanners will not fit, while the closed ring ends provide full bearing contact with the fastener to reduce rounding and slippage during use.

The spanner is manufactured from heat-treated chrome‑vanadium (Cr‑V) alloy steel for strength and toughness and is supplied with a chrome plated finish to resist corrosion and simplify cleaning. The tool meets relevant DIN/ISO/BS dimensional and material expectations for metric ring spanners, and each end is accurately stamped with the nominal sizes (16 and 17 mm) for quick identification. As a hand tool, there is no thread or drive type to consider; the head type is closed ring (box) at both ends, with a slim profile to clear nearby obstructions.

Typical applications include vehicle maintenance and repair, plant and machinery servicing, plumbing and HVAC work, assembly and fabrication in engineering workshops, and general industrial maintenance where adjacent components restrict tool access. The pair of adjacent metric sizes makes this spanner especially useful for working on assemblies that use a mix of 16mm and 17mm fasteners, such as suspension, brake and engine components on many European vehicles, as well as agricultural and construction machinery.

Key benefits are straightforward: the chrome‑vanadium construction and heat treatment deliver the strength required for routine workshop torque, the closed ring ends give maximum contact to protect fastener corners, and the chrome finish improves corrosion resistance and longevity in damp workshop environments. The flat profile improves access in tight assemblies and reduces the chance of the tool snagging on surrounding parts.

Duchy Fasteners stocks this Draper ring spanner (DR02448) individually and as part of metric sets. We carry a wide metric range of flat ring spanners covering common sizes from small to large, available in single pieces, multi‑piece sets and trade packs to suit workshop and professional requirements.