For Gibson® guitars, basses, banjos, and mandolins 2-3/16" x 7/16" x 3/16" (55.56mm x 11.11mm x 4.76mm) Stewart-MacDonald is your source for quality bone! Bone's hardness and density contributes to good tone, it polishes well, and it allows more precise slot filing. Bone is traditionally preferred for making nuts and saddles on quality instruments. Blank nuts have oversize length and height, for custom shaping in your shop. They're ready for trimming, filing, sanding and slotting.