Classic Clock Glass Cut to Size Restore vintage, antique and modern clocks with clear round flat replacement glass precision-cut in the UK. Suitable for many wall clocks, mantel clocks, marine clocks and restoration projects where the original glass is broken, scratched or missing. Our current product uses 2mm flat glass and is available in 1mm diameter increments. The front and back edges are wet-finished for a smooth, clean component ready for careful installation into the original clock bezel or frame. Measure the original glass rather than estimating from the visible opening whenever possible. Check both the diameter and thickness before ordering, particularly where the glass sits inside a narrow retaining bezel.