Wood Guitar Radius Grinding Block for Bass Guitar Fret Leveling Fingerboard Tool for LuthiersSpecifications:Exactly true or change the radius of the fretboard. Used to shape the radiused fingerboard and level the installed fretsDifferent ferries are available: 7.25", 9.5", 10", 12", 14", 15", 16", 17", 20". When working on the fretboard radius compound, simply change the blocks as you progress along the neck. Item Name: Radius Sanding Block Material: Wood Length: 13cm/5.12" (Approx.) Height: 6.8cm/2.68" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included:1 x Radius Sanding Block