Specification: Material: Stainless Steel Color: Black Size: 19 x 25 mm Detailed Size: As the picture shows Installation Method: 1. Drill holes in your sign and make sure the hole size is accurate. 2. Mark the holes of your sign on the wall, make sure the sign is installed in the right place. 3. Screw the anchor screw onto the wall. 4. Install the barrel on the wall. 5. Place the sign or glass and screw the bolt onto the bar. Note: Please allow 1-3mm deviation due to manual measurement, thanks for your understanding.