Features: This product includes 1 double sided etched string action gauge ruler, 2 fingerboard fret protector guards in 2 sizes and a 32 piece feeler gauge set. The double-sided gauge ruler includes a conversion chart of string action at the 12th fret an accurate scale to measure string height, bridge saddle height, saddle slot depth, fret slot depth and nut height and accurately measure other setup adjustments. The 32 stainless steel blades offers a better measuring function. Easy to disassemble. They are well oiled to protect gauges from oxidation and pitting. Blades etched with metric and inch sizes. Stainless steel fret protectors in 2 sizes are specifically designed to protect the fingerboard while working on your frets. Give your guitar a good protection. Specifications: Condition: 100% Brand New and High Quality Material: Stainless Steel Color: Silver Suitable for Guitar Feeler Gauge: 0.0015inch-0.035inch (0.038mm-0.889mm) String Action Gauge Size: Approx. 8.9 x 5.1 x 0.6cm / 3.5 x 2 x 0.2inch Guards Size: Approx. 7.8 x 2.2 x 0.1cm / 3 x 0.8 x 0.04inch 7.8 x 1.3 x 0.1cm / 3 x 0.5 x 0.04inch Weight: Approx. 152g Package Included: 1 x Feeler Gauge 1 x String Action Gauge 2 x Fingerboard Fret Protection Guards