This Fret Rocker can pinpoint those pesky high frets, and check the final height after you've redressed or replaced them. 4-in-1 mini straightedge spans three frets, Precision-machined for accuracy to .0008 inch per foot, the 4 inch, 3 inch, 2 inch and 1-5/16 inch edges make it versatile for any fretted instrument,from basses to guitars to mandolins. Feature - Color: As shown - Material: Acrylic - Size: 10.3 x 5.0 x 0.5cm - This Fret Rocker can pinpoint those pesky high frets, and check the final height after you've redressed or replaced them. - 4-in-1 mini straightedge spans three frets, Precision-machined for accuracy to .0008 inch per foot, the 4 inch, 3 inch, 2 inch and 1-5/16 inch edges make it versatile for any fretted instrument,from basses to guitars to mandolins. - Made of 0.11 inch(2.8mm) stainless steel with a satin finish, for durability in professional use. - It's an indispensable diagnostic tool, before and after partial refretting and recrowning jobs. - It lets you do more accurate fret work for better playability.