ITEM NAME:Metal Guitar Luthier Tools- 9Pcs Under string Radius Gauge + 2Pcs Rubber Co B5E2 Metal Guitar Luthier Tools- 9Pcs Under string Radius Gauge + 2Pcs Rubber Co B5E2 Understring radius gauge makes fast and accurate saddle adjustment. Use these to accurately setup your guitar bridge saddles to match the fingerboard radius, put them under the string or over top of the fret board. Rubber coated metal string spreaders allow you to hold the strings without using your hands or removing the strings from your guitar. The spreaders are to capture the loosened strings and give you room for filing, cleaning, polishing or light repairs. Fret fingerboard guards can protect your guitar fretboard when filing, sanding, polishing and using steel wool to level out your frets. Very strong and durable: Laser-Cut and fabricated from extra thick Metal. Use range: electronic bass/ guitar, acoustic guitar, banjo, mandolin and other stringed instruments. Material: Metal+Rubber Color: silver Set of 9pcs understring radius gauge including: 7.25, 9.5, 10, 12, 14, 15, 16, 17, 20 inch radius Divisore: 8.8 * 1 cm Guarnizione: 7.8 * 2.2 / 1.3 * 0.1cm Packing Include: 9 X Under string Radius Gauge 2 X Rubber Coated Metal String Spreaders (Yellow) 2 X Fret Protector Fingerboard Guards Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.