From Bikeparts
Wera Tools 354 Hex Straight Screw Driver KF+ 2.5mm
Conrad Electronic
Wera 354 Workshop Allen wrench Spanner size (metric): 2.5 mm Blade length: 75 mm
OnBuy
Wera 05023107001 354-2.5 x 75 mm Screwdriver for Hexagon Socket Screws - Silver