17 Pieces guitar luthier tools set guitar radius gauge, string action ruler gauge, feeler gauge, guitar notched radius gauges, guitar neck notched straight edge, fret rocker for electric guitar setup Sturdy and durable: The guitar luthier feeler gauge set adopting stainless steel is rustproof, wear-resistant, sturdy and durable, not easy to break or bend, ensuring long-term use. Foldable feeler gauge: The guitar feeler gauge measures from 0.0015 inch/ 0.038 mm to 0.035 inch/ 0.889 mm, can be applied for guitar spacing distance measuring. Easy to use: All the gauges are in different scales for satisfying your diversified needs, you can use them to measure your guitar according to your own requirements. A great combination of measuring tools for guitar beginners, starters, skillful players and amateurs. Guitar neck straight edge: Good for synthesized 25.5 inch and 24.75 inch scale guitar or other 6 string instruments. Package includes: 9 x Understring radius gauges 1 x Feeler gauge 1 x String action ruler 1 x Guitar neck notched straight edge luthiers tool 1 x Fret rocker 4 x Notched radius gauges Note: Since the size above is measured by hand, the size of the actual item you received could be slight different from the size above.