CruzTOOLS Groove Tech Guitar/Bass 10 in 1 Multi Tool Features:

(4) Metric hex keys
(3) Fractional hex keys
(2) Phillips screwdrivers
(1) 2.5mm slotted screwdriver
(1) Ruler for setting action
Truss rod sizes are ball-end for easy access
All keys are pro-grade, using heat-treated S2 material with a polished chrome finish