The Screeching Halt sound hole cover incorporates a flexible design that promotes quick installation. A special tapered contour allows for a tight, custom fit without endless adjustments. In fact, the Screeching Halt will adapt rapidly to most guitars, allowing the player to crank the volume. The cover will also adapt to most pickup systems without disrupting placement or performance. Furthermore, the Screeching Halt cover is safe with most finishes and inlays. Diameter : 10 cm