Set of 9 Guitar Allen Key Hex Wrenches for Truss Rod, Bridge, Saddle and Nut 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