This Teng Tools Hex key with T-handle has a short arm and a long arm. The short arm allows excellent leverage, allowing easy tightening and loosening. The long arm of the Hex key has a ball point head, which allows a working angle of up to 30 degrees and therefore improves access. Manufactured from chrome vanadium steel for toughness and durability. The TEN510506 T Handle Hex Driver has the following specification Size 6.0mm. Short arm length 15mm. Long arm length 150mm.