The 20MM combination spanner is a hand tool designed for tightening and loosening metric hex-headed nuts and bolts. Its primary use is to provide a secure grip on fasteners where access is needed both for quickly turning with the open end and for greater torque or confined space work with the ring end. This 20 mm size is commonly used on medium to large fasteners in automotive, agricultural and industrial maintenance.

Manufactured from chrome vanadium (Cr‑V) steel and drop‑forged for strength, the spanner is heat treated and tempered to improve toughness and wear resistance. It has a polished chrome plated finish to resist corrosion and to allow easy cleaning after use. The tool combines a 15° offset open end for improved access and a 12‑point box (ring) end to engage fasteners with minimal rounding; the ring end is tailored to ISO metric hexagon profiles. The spanner is produced to common DIN/ISO dimensional standards for metric combination spanners (for example DIN 3113 style geometry), ensuring compatibility with standard metric fasteners. Part reference: DR36924.

Typical applications include vehicle servicing and repair, industrial plant maintenance, assembly work on machinery and equipment, plumbing installations where metric fittings are used, and general engineering workshops. The open end is useful for initial engagement and for working on bolts with limited turn available, while the ring end takes the load for final tightening or loosening where higher torque is required or bolt heads need full contact to avoid damage.

Key benefits are clear: the chrome vanadium construction and heat treatment deliver the strength to withstand repeated use without distortion; the chrome plated finish offers corrosion resistance in workshop environments; and the DIN/ISO‑style sizing ensures the spanner fits standard metric heads without slippage. The combination of open and ring ends provides versatility so one tool can cover multiple tasks, reducing the need to change tools frequently.

Duchy Fasteners stocks the 20MM combination spanner individually and as part of metric sets. We carry a full range of metric spanner sizes, typically from 6 mm up to 32 mm, available in single packs and multi‑piece sets to suit trade and workshop requirements.