Instructions for use:After turning the telescopic screw counterclockwise to the required support height, then turn the middle fixing ring clockwise to to lock and fix it. Product features: The graphics card bracket adopts a retractable screw design, which can a 26-50mm height support interval, and can be used at the bottom of the chassis and the power compartment. Model: -20MINI Process: AL6061 sandblasting/anode Colour:black Material:aluminum Size:Product unexpanded size: 15x15x26mm Weight: 24g Package Contents: 1 x -20 MINI graphics card bracket Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.