This product is a 10-piece extra-long imperial ball end hex key set designed for driving internal hexagon (Allen) socket fasteners where extended reach or angled access is required. The L-shaped keys feature a ball end on the long arm to permit entry at up to approximately 25 degrees, enabling work in confined or awkward locations and on recessed fixings that standard short keys cannot reach.

The keys are manufactured from chrome vanadium (Cr-V) steel and are heat treated and tempered to a hardness of approximately 52–56 HRC to provide the torsional strength required for routine workshop and maintenance tasks. The set carries a black oxide finish to resist surface corrosion and reduce glare, with chamfered, polished tips for positive engagement with hex sockets. The design conforms to ISO 2936 (L-shaped hexagon socket keys with ball end) and to recognised DIN/ISO dimensional tolerances for imperial hex keys, ensuring compatibility with standard internal hex fasteners. Drive type is a 6-point internal hex; head type is L-shaped with long arm ball end and short arm straight hex for maximum leverage close to the head.

Typical applications include automotive and heavy vehicle maintenance, plant and machinery assembly, HVAC and refrigeration servicing, bicycle and small-engine repair, and general engineering maintenance where bolts sit deep in housings or behind obstacles. The extra-long reach suits gearbox work, control panels and any situation where access depth exceeds that of conventional keys. The ball end permits angled entry to reach screws that are not perfectly aligned with the key axis.

Key benefits of this set are improved access to recessed or awkwardly positioned hex screws, reliable torque transmission from the hardened Cr-V construction, and enhanced corrosion resistance from the black oxide finish. Accuracy to ISO/DIN tolerances ensures a good fit with imperial hex sockets, reducing the risk of rounding or damage to fastener sockets. The combination of a straight short arm for torque and a long ball-ended arm for reach makes the set versatile across workshops and site work.

Duchy Fasteners stocks this Draper Tools Group D item (Draper ref. DR33723) as a 10-piece extra-long imperial set, typically covering sizes from 1/16in up to 5/16in, supplied in single packs for trade or multiple-pack options for workshops.