Material:Zinc AlloyColor: Antique Bronze/Oiled Copper Black/BronzePitch-row: Single holePackage: 1 laptop computer manage + screwMeasurements:Dia: 1.2" (30 mm)Back plate: 3.0"x 1.2" (75 x 30 mm)When put in the knob sticks out 1.1" (28 mm)Note:1. Please allow 1-3mm errors due to handbook measurement, thanks on your understanding! 2. All customs duties and processing fee at destination nation are paid through the buyer. 3. We normally match screws 25mm, if you'd like particular size screws, please depart a message when paying the order, or we are able to deliver default size! (Screws size available in 22mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm).