Made of aluminum material with a glossy surface. This is a wonderful accessory for glass tables, tea tables, and more. Features 50mm Diameter x 8mm Thickness, with an M8 Thread Hole. Mounting screws are not included. Package contains 4 Aluminum Discs. Main Color: Silver Tone. Material: Aluminum. Dimension: 8 x 50mm / 0.31" x 1.97" (T*D). Thread Hole Dia.: M8.