Product name: A-shaped headrest office chair Size: 47.5 (length) * 48 (width) * 113.5 (height) CM, headrest: 24CM (length) * 14 (height) Cm Color;: black red installation: 1. When pressing the wheel into the leg of the chair, you can insert it directly at a slight angle 2. Put the air intake rod directly without other fixing 3. Connect the armrest and the backrest with screws (the screws do not need to be tightened first, and then tighten the screws in turn when the cushion is installed) 4. Connect the installed cushion to the armrest. After adjusting the installation sequence, tighten the screws in turn