Set of 9 allen keys with various uses 

• 1.5mm - metric bridge saddle adjustment
• 2mm - bass bridge adjustment
• 2.5mm - Floyd Rose Intonation
• 3mm - Floyd Rose Locking nuts 
  
• 4mm, 5mm, 6mm - Guitar Truss rod adjustment
• 8mm, 10mm - Bass Guitar Truss rod adjustment