Features: 5-in-1: string winder + string action ruler + string cutter + pick case + hex wrench. String Winder: Replace your strings in seconds. Notched head removes bridge pins quickly and safely. String Action Ruler: With scale to measure string height, bridge saddle height, saddle slot depth, pickup polepiece height, fret slot depth and nut height. Perfect accurate action measurements for string instruments such as guitar, bass, etc. Cutter: High leverage handle design to cut thick strings easily. Comfortable rubber handgrips. Pick Case: Can hold 1-5pcs picks of different size. Hexagon Wrench: Diameter: 4mm, for many usual guitars. Specifications: String winder material: Plastic Hexagon wrench material: Metal Cutter material: Metal Ruler material: Metal Pick case material: PU leather Package size: 11 * 7 * 3cm / 4.3 * 2.8 * 1.2in Package weight: 77g / 2.7oz Package List: 1 * String Winder 1 * String Action Ruler 1 * Cutter 1 * Pick Case 1 * Hexagon Wrench