What is this?This fretboard arc grinding block is a fret fretboard leveling and guitar fret repair tool that accurately displays or changes the fretboard radius.What will I get?The Fingerboard is in size of: Length is about 130mm/ 5.12 inch; Width is about 68mm / 2.68 inch; Thickness is about 40mm / 1.57 inch.In the pack of 1 × Radius Sanding BlockAre there any advantages of the product?It is made of wood. The grooved side design and smooth surface make it more comfortable to hold.How to use it?When working on a compound radius fretboard, you just need to move along the neck to change the blocks.What should I notice?Please note the sandpaper is not included.