**Fret Slot Depth Gauge**: - **Purpose**: Crucial for ensuring fretwire fits properly in the slot. Avoid the issue of a too-shallow slot after fret installation. - **Usage**: Quickly compare fretwire to the slot. Hold the flat edge against the fret tang, note tang height relative to reference lines, insert the appropriate curved edge into the slot and re-compare lines. - **Material and Fit**: Machined from 0.018" (0.46mm) stainless steel for durability. Can fit into any fret slot. - **Applications**: Helps in refret jobs, including those with bound fingerboards. Useful for setting the depth stop on an adjustable fret slotting saw and the cutting height of a fret slotting table saw blade. - **Features**: Non-glare etched surface for easy reading. Curved edges are suitable for all popular radiused and flat fretboards.