CRL's UV Large Flat Glass-to-Glass Hinge is free-swinging and designed for 'all-glass' showcases or cabinets. The maximum glass thickness is 1/4" (6 mm). The maximum recommended door width is 19" (483 mm). Maximum weight per pair of Hinges is 16-1/2 lbs. (7.5 kg). NOTE: Lightly scuff (do not scratch) bonding surface prior to applying adhesive.