OUR LUTHIER TOOLS ARE 100% ORIGINAL. For any questions or information, please feel free to contact. Beware of imitation.

LittleBone Fret File

This tool helps to reshape frets worn by use or flattened out after fret leveling. LittleBone Fret File is the simplified version of a more complex project based on alternative concepts of fret work by inventor Davide Bissoli. This model was designed with a unique abrasive base with the optimal operating angle and a compact shape that make it perfect for all skills. The abrasive surface is configured to work only where it is necessary, absolutely not on the top of the fret. It saves your fret leveling and it can help to correct the intonation of the frets. Littlebone Fret File Standard is #400 grit, recommended for R.M. fret leveling systems that usually have a light touch and don't leave big edges on the fret. There is also the #150 grit version for heavy duty. LittleBone400 is also included in the RR Kit (Reload/refinishing Kit).

ATTENTION: if you think to buy LittleBone for steel frets, please remember that its grit is not so different from the grit of the other diamond files. Diamond files are quite delicate and might not last like the others. Although, buyers report that LittleBone #150 and #100 grit are not bad on steel frets. #100 grit is sold under request.


Diamond Grit - Brass Body 12x12x36mm (ultracompact)


LittleBone 400 (classic)

Easy and affordable. Classic version. #400 grit works well with our leveling system. It helps to reshape non heavy worn frets. For reshaping after average fret leveling and bad condition frets, #150 grit is recommended.


LittleBone 150


#150 grit for a more intense use.


LittleBone - double grit


With double grit #400 + #150 for normal and heavy duty.


LittleBone DoubleAngle


Truly original and Patented double angle fret file. Available in grits: #400 and #150.



The three main models of the LittleBone Fret File



Our tools

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Price list

REMINDER: to buy our tools please make sure to visit the How to buy page first. Thank you 

-Prices are in USD

-Shipping price is typical for 1 tool and 1 Kit. Starting from minumum $20.

-RED is out of stock

-RR Kit is accessory (sold only with a leveling tool)

-Final shipping price may vary depending on volume, weight and final destination of the order

R.M.KATANA for guitar $225 +Shipping  $40
R.M.KATANA for bass $255 +Shipping  $50
R.M.nanoKATANA *uke $165 +Shipping  $36
R.M.BUZZ-Killer spot lev.  $80 +Shipping  $25
R.M.LITE for guitar  $40 +Shipping  $35
R.M.LITE for bass  $55 +Shipping  $38
RR Kit (reload/refinishing)  $38 Accessory  
LittleBone #400 grit  $25 +Shipping  $20
LittleBone #150 grit  $20 +Shipping  $20

LittleBone DoubleAngle #400 grit

 $28 +Shipping  $20
LittleBone DoubleAngle #150 grit  $28 +Shipping  $20

LittleBone DoubleGrit


 $28 +Shipping  $20
LittleBone ice #320 grit  $28 +Shipping  $20
LittleBone ice #150 grit  $28 +Shipping  $20
LittleBone ice Special  $35 +Shipping  $20
Digital Action Gauge  $34 +Shipping  $20
FRET RAIL mini  $18 +Shipping  $20
Feather File for nut   $20 +Shipping  $20


About Rectify Master

RECTIFY Master focuses on research and development of innovative and quality luthier tools. Setting new standards since 2010. With over 30 year experience. Beware of imitation.




TOKYO, Japan

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