Custom 3-Inch Multi-Hole Quartz Glass Disc, 2.8 mm Thick, Precision Through-Hole Machining This multi-hole quartz glass disc is a custom-machined circular component featuring multiple through-holes arranged across the disc surface. Based on the product label shown in the photograph, the sample measures approximately 3 inches in diameter and 2.8 mm in thickness. Each hole passes through the full thickness of the disc. The hole positions and spacing can be specified to match