This is a 10-piece metric hexagon key set (Allen key set) designed for driving internal hex socket fasteners. The L‑shaped keys provide a long arm for reach and leverage and a short arm for tight access; the set is intended for general maintenance, assembly and repair tasks where metric hex screws and bolts are used.

The keys are manufactured from S2 tool steel, heat treated for torsional strength and durability, and finished with a corrosion-resistant black oxide coating (satin chrome finish is often available on request). Each key conforms to common DIN/ISO dimensional tolerances for metric hex keys, making them compatible with fasteners specified to DIN and ISO standards as well as typical BS (British Standard) socket screw dimensions. The tools feature a 6‑face internal hex drive and an L‑shaped head type; the long arms are ball-ended to allow entry up to approximately 25° off‑axis on the larger sizes, improving access in confined areas. Thread type is not applicable to the tool itself — it is intended to be used with internal‑hex (socket) fasteners.

Typical applications include workshop and site maintenance, bicycle and motorcycle servicing, automotive trim and component work, furniture assembly, electrical enclosure servicing and light fabrication where metric socket screws are common. Industries that commonly use this type of set include automotive, marine, HVAC, manufacturing, engineering maintenance and facilities services.

Key benefits of the set include the high torsional strength of S2 tool steel, which resists rounding and deformation under normal tightening loads; the black oxide/satin finish which gives improved corrosion resistance compared with untreated steel; and broad compatibility with metric socket screws made to DIN/ISO/BS dimensions. The ball end on the long arm increases accessibility for angled entry, and the selection of ten metric sizes reduces the need for multiple separate tools.

Duchy Fasteners keeps this 10pc metric set in stock in the common size range 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8 and 10 mm, supplied in a secure plastic clip or roll pouch. Single sizes and larger multi‑sets are also available from our UK warehouse.