The surface-mounting FRX Tremolo System for LP, SG, and V-style guitars. The FRX is a direct swap for the Tune-O-Matic and stopbar type bridge system, using the existing mounting stud holes and requiring no routing whatsoever. The locking nut mounts behind your guitar's existing nut, in place of the truss rod cover. The FRX locking nut has two mounting holes on the left and right, and will retrofit many traditional bell-shaped truss rod covers. Please Notice: for covers that only mount at the top and bottom of the bell, two small holes will have to be made to mount the nut. The tremolo kit contains the bridge, locking nut, and all hardware necessary for installation. Locking Nut mounts behind the existing nut, in place of the truss rod cover. Suitable for LP, SG and Flying V-style guitars. Colour: Antique Bronze