This is a 2.5mm Hex Driver with Precision Handle from Wiha.

FEATURES: Tapered handle allows rapid rotation. Rotating cap for precise turning and control with fingertip. High alloy chrome-vanadium-molybdenum-steel blade. Molded on ergonomic handle. Exact fit precision tip. Professional quality.

INCLUDES: One 2.5mm Hex Driver with Precision Handle.

SPECS: Length: 6-5/8" (16.8cm) Tip Size: 2.5mm ir/kh  

BOX DIMENSIONS: .50" W. X .50" H. X 6.75" L. BOX WEIGHT: .04 LBS.