bridge for e-guitar roller bridge model, with studs, nickel, 15&;quot; radius, M8 thread bolts The roller parts will help keep your guitar in tune better when bending strings or using a vibrato system. specifications bridge diameter anchor: 12mm length anchor: 20mm thread studs: M8 diameter studhole in bridge: 6mm spacing studs: 74,0mm stringspacing E-e: 52mm radius: 15&;quot; wire retainer: no saddles notched: n. a. finish: nickel