This is a 5 mm hex insert bit with a 10 mm hex drive shank and an overall length of 30 mm, designed to insert into compatible bit holders, driver sockets or quick‑change chucks. Its primary use is to engage fasteners with a 5 mm internal hex (Allen) recess — commonly found on machinery, furniture fittings, brackets and maintenance components — while offering a 10 mm hex drive for robust connection to hand ratchets, T‑handles and larger bit adapters.

The bit is manufactured from industrial S2 tool steel and is heat treated for improved toughness and wear resistance. The external finish is a black phosphate coating to give baseline corrosion protection and to reduce galling when used in repetitive assembly tasks. The tip is machined to a precise 5 mm hex profile and the shank is a 10 mm hex drive; the product is produced to commonly accepted DIN/ISO dimensional tolerances for interchangeable bits and to relevant British Standards for hand tool components, ensuring compatibility with standard holders and sockets.

Typical applications include light engineering, automotive maintenance, M&E installation, joinery and on‑site repair work where 5 mm hex socket fasteners are used. The 10 mm hex drive provides a positive, non‑slip connection for increased torque transfer compared with smaller 1/4" shanks, making this bit suitable for workshop ratchet drivers and robust hand tools. It is also useful in assembly lines and maintenance departments where quick change between sizes is required.

Key benefits of this bit are its material strength and interchangeability. The S2 tool steel construction gives resistance to fracture under load; the heat treatment improves tip life in frequent use; and the black phosphate finish provides corrosion resistance in typical workshop environments. Compatibility with common DIN/ISO drive systems means the bit will fit standard holders and sockets, reducing the need for specialised adaptors.

Duchy Fasteners stocks this style of hex bit across a range of sizes and pack quantities. Available sizes and pack options can be supplied individually or in multi‑packs to suit workshop stocking and trade requirements. If you need a specific size or pack quantity, contact Duchy Fasteners for current availability.