100PCS Watch Crystal Glass Sapphire Part 40mmConvex Replacement Repair Tools. 100pcs 1.5mm Flat Mineral Watch Glass. Thick: 1.5mm (there might be ±0.2mm difference). Size: 24/24.5/25/25.5/26/26.5/27/27.5/28/28.5/29/29.5/30/30.5/31/31.5/32/32.5/33/33.5/34/34.5/35/35.5/36/36.5/37/37.5/38/38.5/39/39.5/40mm. 100PCS x Watch Crystal Glass. Track Page Views With. Auctiva’s FREE Counter.