KAISH Double-sided fret file, for crowning frets after leveling; One edge has a coarse cut for rapid removal of metal and the other edge has a fine cut for smoothing off and more precision. The coarse side and fine side are indicated on the rubber grip clearly 

The arrow shows the filing direction, make sure to use the right filing direction; It can not be used in both directions

The files are wrapped in a rubber grip for comfortable and non-slip use, ergonomic design is good for grip and makes fret crowning quicker and easier

Made of premium carbon steel; 1mm version is designed for narrow frets common used on ukuleles/mandolins; 2mm version is designed for medium/standard frets; 3mm version is designed for jumbo frets