Zero Glide ZS-17F Acoustic Guitar Nut for Fender-Style Bass Guitar Kit Includes: 1 Bone Zero Glide Nut, 4 fret sizes, instructions Length: 42.0mm (1-21/32in) Width: 2.5mm (3/16in) Height: 5.5mm (7/32in) Spacing: 31.75mm (1-1/4in)