Hosco Japan H-GB4 Groobar Nut Slot Filing Guides – Set of 4
A handy guitar setup tool designed to help prevent filing nut slots too deep.
The Hosco Japan H-GB4 Groobar Set is a specialist guitar maintenance accessory designed to assist with accurate nut slot filing.
When adjusting a guitar's nut, filing the slots too deeply can cause unwanted string buzzing and may require the nut to be repaired or replaced. These Groobars provide a useful reference when filing, helping guitar technicians, luthiers and musicians avoid removing too much material.
The set includes four non-hardened steel bars in different thicknesses, allowing you to select a suitable guide for your setup work.
Compact and practical, the Hosco H-GB4 is a useful addition to any guitar repair bench or maintenance toolkit.
Key Features
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Nut Slot Filing Aid – Helps prevent filing guitar nut slots too deeply.
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Set of Four – Includes four bars of different thicknesses.
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Non-Hardened Steel Construction – Designed for use as nut slot filing guides.
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Useful for Guitar Setups – Assists with nut adjustment and maintenance.
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Compact Design – Easy to keep in a guitar technician's toolkit.
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Specialist Hosco Tool – Suitable for guitar repair technicians and luthiers.
Groobar Sizes
| Marking |
Thickness (mm) |
Thickness (inches) |
| L |
1.07 mm |
0.042" |
| L |
1.27 mm |
0.050" |
| M |
1.42 mm |
0.056" |
| H |
1.65 mm |
0.065" |
Technical Specifications
| Specification |
Details |
| Brand |
Hosco Japan |
| Model |
H-GB4 |
| Product Type |
Nut Slot Filing Guide |
| Material |
Non-Hardened Steel |
| Quantity |
4 Bars |
| Thickness Range |
1.07–1.65 mm |
| Application |
Guitar Nut Slot Filing |
| SKU |
H-GB4 |
| EAN / Barcode |
4518830802375 |
Ideal For
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Guitar technicians and luthiers
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Guitar nut adjustments
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Nut slot filing and maintenance
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Guitar repair workshops
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Musicians carrying out their own guitar setups
Make Nut Slot Filing Easier
Correct nut slot height is an important part of a comfortable guitar setup. Filing too deeply can affect playability, making careful measurements and suitable tools essential.
The Hosco H-GB4 Groobar Set provides a practical aid for working on guitar nuts, helping reduce the risk of removing too much material.
Available from Everest Music & Piano Centre, Bray, Co. Wicklow, with delivery throughout Ireland.
