Dimensions: 1-11/16" (43mm) Length x 3/16" (5mm) Height x 1/8" (3.4mm) Thickness. 1-3/8'' (35mm) E to E string spacing. Radiused bottom with universal center tab for flat bottom slots. We have done all of the most time consuming and skilled work for you. Mojo bone nuts come to you pre-slotted and pre-shaped from high quality bone that have been CNC machined very accurately. If you are a busy repair shop, builder, or just a player that wants to improve your tone, these will save you a ton of time, trouble, and money.