The Safe Slot Nut Guard is a tool for setting nut slot depth and spacing on guitars. Here's a simple summary:

1. **Nut Slot Depth**:
   - Use feeler gauges stacked against the nut to set the slot depth. When the saw touches the gauges, you've reached the right depth.
   - The Safe Slot Nut Guard holds the feeler gauges tightly against the nut and matches the fingerboard radius. This frees up both hands for filing and prevents cutting too deep.

2. **String Spacing**:
   - The tool helps with proper string spacing. Thicker wound strings need more space than thinner treble strings.
   - The set includes a String Spacing Rule to mark where each string slot should be. Just slide it into the Safe Slot, and you can see where each string belongs without measuring or calculating.

3. **Other Features**:
   - The set includes tapered wedges for trimming the nut top on both electric and acoustic guitars.
   - The felt-padded caul of the Safe Slot Nut Guard fits most neck shapes and fingerboard widths up to 2-1/16".

4. **Included Items**:
   - Safe Slot Nut Guard
   - Electric and acoustic wedges
   - String Spacing Rule
   - Feeler Gauge Set with 11 thicknesses ranging from .016" to .040"

This tool makes nut slotting easier and more accurate.