Chair specifications: Armrests: Made of plastic, connecting the back to the seat. Padded with upholstery for hand comfort. 🔄 Swivel capability: Back and seat can swivel in parallel backwards up to a 120-degree angle. 🔧 Lifting mechanism: Adjustable height (up or down) and lockable as desired using the hydraulic system (item number 423). Product mechanism: Standard mechanism number 426, designed to withstand normal use up to 120 kg. Chair base: Made of nickel-plated iron, durable. Designed to safely support heavy weights up to 180 kg. Base with a diameter of 70 cm with 60 mm diameter rubber-coated casters for smooth movement. 📏 Dimensions: Seat: Width: 54.5 cm Depth: 47 cm Back: Width: 54 cm Height: 69.5 cm This product is shipped unassembled and requires the customer to complete the assembly according to the video via the following link: Assembly tutorial video