This is the Revolution Design Racing Products 2.5mm Ultra Wrench. Revolution Design Ultra Series wrenches feature a machined 7075 T6 handle that provides a great grip for your hand, while helping to reduce fatigue and eliminate the chance of blisters after hours of wrenching. The handle is black hard-anodized, with a laser etched RDRP logo.
The blue end cap indicates that its a metric measurement tip, and the size of the tip is marked with large letters on the cap and again on the tip for easy identification. But, the most important part of a good wrench is the tip. RDRP Ultra wrenches feature a high grade spring steel tip that will provide a long life and is precision ground for a tight fit on the fastener.