ammoon 5 in 1 Guitar Accessories Kit Setup String Winder Bridge Pin Peg Puller + String Action Gauge Ruler Measuring Luthier + String Plier Nipper Cutter + Pick Case Plectrum Holder + Hexagon Wrench 5-in-1: string winder + string action ruler + string cutter + pick case + hex wrench. String Winder: Replace your strings in seconds. String Action Ruler: Perfect accurate action measurements. Pick Case: Can hold 1-5pcs picks of different size. Hexagon Wrench: Diameter: 4mm, for many usual guitars.