Available for both 1/4" and 3/8" (6 and 10 mm) thick glass, the Extrusions come in the following finishes: Brite anodized, brite gold anodized, brushed nickel, and white. 18", 24", and 36" (457, 610, and 914 mm) long Shelf Kits come with one pair of matching plastic End Caps. All lengths come with Thermal Plastic Rubber (TPR) Strips to cushion the glass.