Notched Straight Edge and Fret Rocker Fretboard Ruler Bass Guitar Neck Ruler.This tool set includes both fret rocker leveler and notched straight edge, which are made of high quality stainless steel.The two sides design of the neck notched straight edge could work with most electric or acoustic guitars, and it is a ideal tool set to ensure your guitar fret board straight and flat.Fit for electric guitar, acoustic guitar, bass, mandolin, banjo, folk guitar, electric box guitar etc.It is a necessary tool set for guitar players, which is stable,durable,beautiful and widely used.These guitar luthier tools are good gifts to guitar technicians and guitarists to maintain and repair their instrument themselves in a short time, reducing buzzing.Guitar Neck Notched Straight Edge Fret Rocker. Fret Rocker String Height Gauge for Fretboards. Guitar Neck Notched Straight Edge Gauge Ruler. String Action Ruler Stainless Steel Luthiers Tool. Electric Bass Guitar Repair Tool Fret Rocker.