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The Compact Short Arm Allen Key Set With the Sizes Others Leave Out
Thirteen short metric hex keys, 1.27mm to 10mm, with compact arms from just 40mm to 112mm. Includes the 3.5mm, 4.5mm and 5.5mm half sizes most sets leave out, in one friction clip holder with clear size markings.
Where a long key will not swing
Long keys need swing room - and close to a wall, inside a cabinet or behind a machine guard there is none. Short arms work in the space a screw actually gives you, turning fasteners a full-length key cannot reach without fouling on everything around it.
Reach with the ball, tighten with the short arm
The 25 degree ball end is for access - it turns a screw at an angle when you cannot get in straight. Once the screw is seated, switch to the chamfered short arm for final tightening. It grips the full hex and takes the torque the ball end is not shaped for.
Industrial CR-V steel, rust resistant satin
Each Allen key is forged from chrome vanadium steel and heat treated to resist bending and rounding under torque. The bright satin finish resists corrosion and wipes clean, keeping the size markings easy to read for the life of the set.
Allen key sizes (short arm x long arm)
| 1.27mm | 12 x 40mm | 4.0mm | 24 x 70mm |
| 1.5mm | 14 x 45mm | 4.5mm | 26 x 75mm |
| 2.0mm | 16 x 50mm | 5.0mm | 28 x 80mm |
| 2.5mm | 18 x 56mm | 5.5mm | 30 x 85mm |
| 3.0mm | 20 x 63mm | 6.0mm | 32 x 90mm |
| 3.5mm | 22 x 66mm | 8.0mm | 36 x 100mm |
| 10mm | 40 x 112mm |
Sizes subject to manufacturing tolerances, approximately +/- 2mm.
Why choose this set
- Compact arms work where full-length keys will not swing
- Covers the 3.5mm, 4.5mm and 5.5mm half sizes most sets miss
- CR-V steel and heat treatment for strength and durability
- Ball ends and chamfered tips for angled access and clean engagement
- Small enough for the toolbox drawer, van door pocket or bike bag
Care and use
Keep the keys clean and dry, and apply light oil before long-term storage. Always use the correct size key for the screw, and tighten with the short arm rather than the ball end.











