The SRAM set was created to make shopping for Fix It Sticks easier.
After investigating various SRAM components it appears as though a 2.5mm, 4mm, 5mm hexes and a Torx 25 bit all seem to work very well within the SRAM drivetrain systems and brakes.
Choose between Steel (tough) and Aluminum (light)
Steel set - Finish varies - 97 grams (max torque 40 newton meters)*
Aluminum set - Orange - 55 grams (max torque 15 newton meters)
SRAM has no affiliation with this product