Anti-roll Plate, 50 mm (L) x 29 mm (W), 3 mm thick; replacement glass for Leica CM1520, 1860/1860UV, 1950 and 3050S Cryostat anti-roll systems. Note: Before ordering this SKU, PLEASE MAKE SURE you want this item and not the more popular LGI70. LGI50 is 50mm long, LGI70 is 70mm long.