This 10pc Extra Long Metric Key Set is a set of L‑shaped metric Allen (hex) keys designed to reach recessed or awkward fasteners where a standard key cannot. The long arm gives additional reach and leverage while the short arm provides torque for initial loosening or final tightening. It is intended for use with internal hex (Allen) socket fasteners in metric sizes on machinery, vehicles, furniture and general industrial equipment.

The keys are manufactured from heat‑treated chrome‑vanadium steel and finished with a black oxide coating to resist surface corrosion and reduce glare. Each key is hardened and tempered to provide torsional strength and wear resistance appropriate for repeat use on hex socket screws. The set features L‑shaped heads with a ball end on the long arm to allow an angled approach (approximately 25°) where direct access is not possible. The keys conform to recognised DIN/ISO/BS dimensional requirements for metric hex keys, ensuring correct fit to hex sockets and compatibility with ISO metric internal hex fasteners.

Typical applications include automotive and motorcycle maintenance, plant and machinery assembly, cycle and sports equipment repair, furniture assembly and general workshop or site maintenance. The extra‑long reach is particularly useful for accessing fasteners positioned deep in housings, behind brackets or through clearance holes, while the ball end facilitates assembly work where the key cannot be held perfectly inline. The chrome‑vanadium construction and heat treatment provide a balance of strength and toughness to reduce rounding of socket corners and extend service life.

The set improves efficiency by reducing the need for removable extension bars or socket adaptors and by providing a single, organised holder for transport and storage. It is compatible with metric hex socket fasteners across the included sizes and suitable for both professional trade use and serious DIY. Duchy Fasteners stocks this Draper Tools Group D (DR33895) 10‑piece extra long metric key set in its standard pack format, supplied on a labelled plastic holder; alternative size packs and bulk quantities are available on request.