Check the listing for details. Guitar String Locking Nut for Floyd Rose Style Locking Guitar Tremolo Black. Color: Black, Condition: New. Listed at 8.99 USD. Oletone Guitar String Locking Nut for Flord Rose Style Adjustable Height Locking Guitar Tremolo Bridge with Mounting Screw Shims and Wrench Black. PRODUCT DESCRIPTION This item is for a black 42.5mm locking nut for floyd rose with mounting screws shims and wrench. Excellent value accessories, high quality material and craftmanship for the price, height adjustment of the strings at the neck end. Black color, Zinc alloy material, durable and long lasting, length: 42.5mm(1.67inch), Width: 16mm(0.63inch), Height: 13.7mm(0.54inch). 42.5mm length and 16mm width seems to be the standard size for electric guitar, can be used with your double lock system on a Floyd Rose. A nut lock is used on quality guitars instead of the nut at the end of the neck, and allows the strings to be clamped at the nut, this will stop the guitar going out of tune after string bending or use of tremolo. It comes with everything pictured. Includes lock nut assembly with mounting hardware, height adjust shims, 2.5mm and 3mm allen keys that you can adjust to set the height of the nut. PACKAGE INCLUDE 1 x Locking nut 1 x Shims 2 x Mounting screws 2 x Allen wrench NOTE Light shooting and different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is +/- 1-3cm