Genuine Floyd Rose German made 'R3' locking nut, Black, Floyd Rose Part # FRNR3BPThis is an original Floyd Rose German made locking nut, manufactured from hardened steel.R3:Width: 1.6875"/42.85 mmRadius: 12"/305 mmHeight at D: .278"/7.10 mmE-E Center width: 1.4155"/35.95 mmString Spacing: .2591"/6.6..