Features: 1.This set of tools is designed to help with common maintenance and adjustment guitar troubles, measuring electric guitars, electric basses, acoustic guitars, and acoustic guitars. 2.32?blade feeler gauge, measuring range from 0.0015in/0.04mm to 0.035in/0.88mm, coated with light oil to prevent rust and sticking, thumb screws are easy to remove and protect. 3.The 9 lower chord radius gauge is made of stainless steel, a set of 9 including: 7.25in, 9.5in, 10in, 12in, 14in, 15in, 16in, 17in and 20in radii for guitars and shellfish The piano making tool of the company. 4.This 2pcs guard ring gasket is used to protect your guitar or bass guard plate from scratches or damage while filing and polishing. 5.The grindstone is designed to protect your guitar or bass board from scratches or damage, while filing and polishing. specification:Item Type: Guitar Repair Tool Material: Metal PackageList: 9 x T Ruler 2 x Guard Board 2 x Grinding Block 1 x Feeler Gauge 1 x String HeightRuler 1 x Triangular Ruler